Spotting

Dirah
So on Saturday I had sex for the first time in a 1yr & 1/2  & ive been spotting every since then. And it's now Tuesday & I'm having mild cramping with a sore vagina. I've google what could that mean but I didn't really find anything relevant to me. I ask my bff and she said it's because I was really tight and it's been a while.Does anyone possibly know what the spotting could mean ? Btw we used protection.