I feel different. Do these things mean I'm pregnant?

My boyfriend and I have protected intercourse regularly. But there have been a couple questionable times around January 15/16 of how protected it really was. My last regular period was January 4-8th. My period this month (feb 5-9) started a day late. But it was light brown, pink/purple, and extremely light for two days and then bright red for a less than 16 hours. Then back to almost nothing but the pink/purple/brown blood. This is completely unusual for me regularly. Any one else dealt with this before?

Ive been sick to my stomach off and on Since last friday. And for the last 6 hours I've had a weird pinching pain in my lower abdomen but it goes away after a few seconds. I don't have cramps when I'm on my period usually. Before I got my period this time I knew something didn't feel right with my body but I couldn't tell what it was. I plan on taking a pregnancy test tomorrow. Is there anything else that may be causing these symptoms besides a possible pregnancy?