Pregnant on pill?

So basically my bf and I broke up and the last time we had sex was sometime in mid-May. I’m on the pill and we use condoms but sometimes he pulls it off early. I’m also almost 90% positive that I’m still ovulating on the pill. I’ve had 2 “periods” since then but they’ve both been lighter and shorter than usual. I used to go through atleast 2 tampons a day but now it’s barely 1. My most recent one started this past Wednesday and now is basically done 2 days later. I normally don’t worry but I’ve been hearing so many stories about women how still have some bleeding like a period during early pregnancy. Should I be worried about pregnancy or just stop overthinking?