Congrats on your success so far!
There is one thing I'd like to delicately caution you about becoming pregnant at 245 pounds, (because of your fear of gaining back any weight you have previously lost.) Being at 245 (BMI 40.8)puts you in the morbidly obese category, and while you will be much more comfortable at that weight going into a pregnancy, (than your current weight), you will still be considered a high risk pregnancy. The worry of regain might be curbed when the doctor warns you of your very high risks of preeclampsia, and gestational diabetes, as well as other health concerns for you and the baby. Overweight women have babies all the time, and everything usually all works out okay, but going into a pregnancy already obese, you will have to watch every bite you take, you can't afford to gain but the minimum during your pregnancy...
What I'm trying to say is, if you fear gaining (back) any (lost) weight while pregnant maybe you should reconsider your plan to become pregnant until you are at a lower weight. If your fears become reality and you do gain a large amount of weight, you'll put you and your baby at a much greater health risk. KWIM?