Cramping on the pill? Please answer!!

So I lost my virginity to my boyfriend on Thursday and I bled a little bit, but ever since then I've been having little cramps here and there. I am on the pill and I took it late a couple hours on Monday but I took it my regular time every day since then, could the cramps be because of that...? I still have a week until my period and this is my third month on birth control so it's weird to me that I have random little cramps and I don't know if it's because of sex or the pill. Thanks in advance