What's wrong, Could I be pregnant?

The last day I had sex was on the 14th of this month. I started my period on the 16th except it was light which is unusual for me because Ive always been heavy flow. It lasted two days of light bleeding then stopped and usual I have 4 days. My nipples were still sore as if I was on my period for the whole week until yesterday. Ive had cramps but not bad just tiny cramps and been feeling queasy every single day. I woke up one night cause it felt like something inside my stomach was pulling almost as if there was a magnet inside me and someone had one on the outside. Today I went to the bathroom and there was pinkish/peachish color when I wiped. Could I be pregnant?