Maybe you should just wait and see what happens ( in relation to your period) as you "think" you had AF but maybeyou justwere still bleeding post partum... I bled after DS for 6 weeks non stop then it stopped for a week or so and then I bled again for about a week.. it wasnt AF because It didnt come back .......

I got my first real AF 9 month PP and then we were careful, using only withdrawal , until we decided to try for baby number 2 , which was when DS was 18 months old.... and then it still took 3 months to fall pregnant.. a m/c and now we are nearly there and he is nearly 3

Id say see what your body does. After all any hormones are going to mess with you, your bf and possible future fertility by messing with your cycle