Pregnant or ?

I’ve been on bc pills for about 4 years now. My bf and I have been very careful about sex...we’ve been using condoms and he’s been pulling out (I know this isn’t a reliable method but I’m on the pill). Recently this month, he’s started to finish in me. This has happened maybe 3 times this month? I’m already on day 3 of my placebo pills and this morning I started to feel some cramping. I went to the restroom and saw there was blood as if my period was starting. I stuck a tampon in and when I took the applicator out it was covered in blood. Later on my bf and I had sex but when I took the the tampon out there wasn’t a lot of blood. I put another one back in after and took it out about 6 hours later and there was even less blood. Sometimes my periods start out very slow like this but I guess I’m just more worried now that he’s been finishing in me. I will admit Ive had a few missteps when taking my pill this month (I have other months as well but nothings happened). Any thoughts???