I'm confused?

My boyfriend (ex now ) have had been trying to conceive for a long while before we broke up. But I got what I think was my period Thursday but ended two days later. I usually last all 7 days. It was also very light! I got minor cramps but I was throwing up like crazy. And I've read online that it's possible to be pregnant because your body might be getting use to it.. But I don't know.. I don't know what to do.. I don't want to inform my ex about this because we recently broke up and I'm not ready to speak to him... So ladies in your opinion what do you think I should do?