I had lochia until 5 weeks then a week off then AF. She was back to stay, i had her every 28 days from then on. I exclusively BF for 4 months and 3 weeks, and then BFed a t least some milk every day until 7 months, so i was bummed! LOL. My mum was the same, she got PG within 6 weeks of birth twice (3 bubs in 3 years) before she stopped believing "You can't get PG if you BF" which the midwives KEPT telling her, even after #2 was born. Some people just aren't very sensitive to prolactin (the hormone which powers milk supply and in many women stops ovulation too).

Bx