I Am On Day 37 On Day 32 I Had

I am on day 37 on day 32 I had what seemed like a period until the evening the next day when it suddenly stopped. The day after I had some pink spotting only when i wiped in the morning then none all day then again in the evening. Followed by a few days of light brown when I wiped. So far the pregnancy tests are saying negative. I have mild cramping here and there and feel pressure. Is it possible I am pregnant?