CONFUSED

Hello ladies I'm a bit confused. Last month on the 30th I started my cycle. So I think. The first 2 days was rustic brown and it got a bit red as time went but it wasn't heavy at all. It was just enough for a panty liner. Anyway, it lasted for a whole week after that a couple of days passed and I started spotting. I spotted every other day of then for 2 days straight and even after sex. I tested and it was negative. But a couple of days ago I've had some cramps that come and go. Sometimes they are really bad and sometimes they are just a little painful but at the same time my nipples are extremely sensitive. They hurt to put a bra on, the towel, and a shirt as well. They all so hurt when I lay on them too. Could I be pregnant?