I don’t know if I could be pregnant. Spotting

Around 2 weeks ago I had sex and we didn’t use protection besides him pulling out. I usually get my period around the 15-20th of each month. About a week ago I thought I had my period but it was really light. And the beginning of my periods are usually heavy. I had cramps for a day or so too. I would be thinking that I was bleeding but it would still be light or really light and it lasted for a about a week. I read somewhere that spotting is usually very light in color but mine showed up pretty red and brown. I still haven’t gotten my period yet.

Also something else was weird too. Around that time I noticed that my nipples were really dry and they appeared dry too. They’ve never really been like that before. I haven’t had any other symptoms. At least not extreme enough for me to notice.