Help please

So I’m on cerelle (Mini pill ive been on this for almost 6 months and I don’t think I’ve ever missed one) and I get 2 periods a month with this. I had unprotected sex about 3 weeks ago and my boyfriend came inside and the next day my period came, but for the whole time it was so light I didn’t need a pad which was unusual. My boyfriend came inside again on Monday and I’ve had some really really light spotting and cramping since then because my period was due but I’m scared could I be pregnant I’m on the pill please no hate I’m really worried