I nursed #1 for 12.5 months and got AF back at 7 months post=partum. I nursed #2 for 5.5 months (his choice to stop, not mine!) and got AF back at around 6-7 months PP. I think it really all depends on the person. I know one girl who does not get AF back until she's done BF'ing...regardless how long that is.
BRAVO! for BF'ing!! Are you actually BF'ing, or just pumping? If pumping, did you have a problem BF'ing? I had problems with both. #1 for the first 4 months, tell we both "clicked". #2 just never wanted to. My theory is because I was GB+ w/him and had to have antibiotics during labor. He ended up with thrush, which made it nearly impossible to BF.
I pumped exclusively for a couple weeks, but I couldn't keep up and gave up.
If you're exclusively pumping, you will not get as much milk as nursing. It's supply & demand. The more you nurse/pump, the more you'll get. You can try Fenugreek, oatmeal, beer to increase supply, or you can get an Rx from the dr. for...crap, I forget the name of it...anyway, it worked great for me! I tried the natural remedies, but they didn't help.
OK, I've written a book...sorry...it's a passion of mine!
Hope it helped a bit!