One word:
LOGGING! 
I was pushing myself excessively hard and was struggling to lose weight like crazy last year. I sort of snapped into a relapse when some big life issues came up (car was broken down for months, adopted a needy puppy, had to put my cat to sleep, a cousin was dying of cancer, was trying to sort out old issues with a family member that was going through a divorce, etc.). And boy, did I ever snap!
I'd been either losing weight or maintaining my losses since 2004(!), and last fall was my
only significant regain in that time. I went from 243 to 267 in a matter of months. All that hard work and struggling last year felt as if it did nothing but tease me.
I was already in the 260's by early December when I found out I was pregnant for the first time, surprise!
After a lot of excited planning with my husband and extended family (my sister-in-law was pregnant too!), my health had a major wake-up call in mid-January . . . all the hopes and dreams of my first baby ended in a miscarriage.
Not that I want to be all depressing, but sometimes that harsh reality slaps us in the face and resets our priorities. I decided I couldn't let my health go any longer. I stopped the insanity of gaining like mad while giving myself time to mourn and mentally prepare myself for the long haul of a healthier lifestyle. I took new photos of myself to file away for later (they were really hard to look at but I knew I'd appreciate them after making some progress). I shopped around and bought a pretty day planner from Barnes & Noble. I thought through my meal and snack choices, and wrote out ideas for healthier substitutes. I started copying down nutrition information of what would work for my new plan from my favorite restaurants. I reminded myself of what worked for me before and what didn't. And on March 5th, I took the big plunge with my new commitment; my biggest step was writing down my every meal in the pretty day planner. Later on I started recording other events and ideas in that planner, anything I was doing or wanted to do that would contribute to a healthier lifestyle. I also log my weekly weigh-in on the pages. My major rule? I have to fill that book up, I just have to; no ifs, ands, or buts. Even if I'm having a really crappy day and don't want to log my food, I do it anyway and even write a little to explain how I'm feeling. I can look back on my choices more objectively the following day and do better the next time I'm in a similar situation.
I can't say that logging a day planner will work for you, because everyone's a little different; you just have to find something that calls to you. Some really like the digital logging through websites and/or apps that track all the macronutrients for you. I happen to like having and holding something physical that I write in by hand, and I've found it's much harder to "forget" when I keep the planner sitting next to my favorite chair (I always "forget" to log digitally, lol). I personally don't count calories, carbs, or anything like that (doing so makes me anxious and even bitter) but I do remain "calorie aware," watch my portion sizes, stay away from simple carbs as much as possible, and try to eat a lot of veggies. I do think that logging in and of itself is important, no matter how you choose to do it! It's a way of staying aware and accountable for your actions, and gives you a chance to review and tweak your plan as necessary.
So give it a try! Commit yourself to a certain time frame (maybe a month) and see how it goes. Track everything you eat, record your exercise, write down/type how you feel, and note when you take prescription drugs, OTC's, and any supplements. Look for patterns and make positive changes. I personally have an enormous sense of accomplishment whenever the week is over and I get to tear the little corner out of the page; it means I'm another week closer to a healthier, happier me! It doesn't take much effort and the rewards make it so worth the small amount of time it takes. It's so easy to eat something and forget it later, or not even realize it at all. Tracking helps avoid falling into the trap of forgotten/denied food.
I see that you'd like to lose a pound a week. That's what I've been averaging ever since I started the planner (41 pounds in 43 weeks)!
For me it's been an enormous motivation and I credit all the weight I've lost this year to keeping that little book. I have a weight loss charm bracelet and
one of the charms is a book to represent my planner, it's
that important to me.
I also take new photos every so often and compare them to the ones I filed away earlier this year; I still have days where it feels like I've accomplished nothing so they're a great reminder that all this work is indeed paying off.
Oh, and one more thing I do . . . I use
a free app on my phone to make an actual chart for my weight every week (which works better than the one you see in my signature since it's easier to see). It gives me something visual to look at other than my body, which is often hard to see objectively. It helps because there are many times I want to throw in the towel just because I didn't lose for the week, but if I stop to look at the overall trend, I can see my weight slowly but surely climbing downward.
Here is a screencap I took of it last month.
Good luck to you! Do some thinking and planning, and figure out what kind of tracking you can stick with and get started. Think of how much better you'll feel after you get a few days, weeks, and months under your belt. While I don't have PCOS, I'm like you in that I want to be a mom someday, and neither of us can allow any health issues to get in the way of that.
Do what you can
now to establish healthy habits and ensure a strong, bright future for yourself and your family.
You'll be thankful for it later.
Back, and Bigger than before
