Anyone have like barely there lines on a pregnancy test 6-7 weeks after birth?

I’ve taken several over the past days even tho it’s only been a week since I’ve had sex (YES I WAITED 6 WEEKS). They’ve all seemed like they had a little something on them but not even dark enough to see an actual line, more like a shadow or something like just something catching your eye. But they’re not getting darker or anything so i wouldnt think it’s a true positive?? I had signs of ovulation around the time i had sex for the first time pp & didn’t realize until a couple days later, hence why I’ve been testing SO early.