Lucky you:) I got my period 11 weeks pp and am still BF at 16 1/2 months! Anyway, I am 5 weeks pg with #2 and still BF DS#1 3 times a day. I read a bit about it, it is fine assuming you are of good health.
This is some good info for you about fertility and BF:
I got AF at 14 mos. while I was still EBF. I got pg that same month :-)
I had been on the minipill until 12 mos.