I stopped breastfeeding my son after six weeks due to two boughts of intense mastitis. I had one period about five weeks after I stopped and then six weeks later I began craving peanuts. That's when I found out about being pregnant with my daughter. They are 12 1/2 months apart. I never knew how fertile you are at that point but, believe me, with a three month old, we weren't breaking any records for trying to get pregnant! It took me a lot longer to get pregnant with the third but all is good now. Good luck to you!
Once your get your period, I would start charting your basal body temp. Lots of info on the net about it. It will give you a good indication of when and if you are ovulating.
I did not actively try to get pregnant while breastfeeding, but do know women can and do conceive while bf. I suggest you starting doing basal body temps in the morning (the best you can with an 8 month old) and see when you are ovulating. There is a great website, fertilityfriend.com that you could use, and it answers a lot of questions. I have looked at many charts of women who are breastfeeding, either trying to get pregnant, or using it to keep from getting pregnant. Good luck!!