Im 20 years old. I just started keeping track of when I get my period about 8 months ago. I usually get it every 27-30 days. Ive never been on birth control. About 2 months ago I started having sex with my boyfriend, and to be honest we havnt been all that careful. Once the condom broke, and most of the time he just pulls out. And we usually keep having sex after he cums, without taking a break. I got my last period on December 15th, its been 36 almost 37 days now since my last period. A couple weeks after I got off my period I started spotting. Ive never done that before. It was thick, brown and only lasted for a couple of days. Ive been cramping ever since then and Im constipated... Im scared I might be pregnant. I havnt been stressed out about anything and I Know that we havnt been all that careful so it is possible. But how likely is it that I could be pregnant?