Just got a bfp! trouble pinpointing due date...late ovulation?

my last period was july 16th, i took a test 28 days after and it was neg, then again at 34 days and still neg. I went another couple weeks and i got a bfp! Im uming that I ovulated way later in my cycle. Im still nursing my daughter so I think thats what threw it off. How far along am I?