Preg after baby

I had posted not that long ago about recently having a baby (8 weeks ago) and being scared to death I might be pregnant again. I took a pregnancy test before which was negative but decided I should wait and take another later. Well I still haven't started my period. I know it can take some women up to three moment to start again BUT I was afraid still. I've been back on BC for two weeks now also. The latest I've ever started my period month to month normally was the third. And last time I got pregnant I ironically tested on the third and it was positive. It's the third and I just took a PT and it said not pregnant. I still need opinions though. Do you think that I'm probably for sure not pregnant now just still haven't started back my periods yet or do you think there's STILL a chance I am?