pregnant?

Could I be pregnant? My first day of my last period was on February 15 and my last day was the 19th. I ovulated from March 4th to the 10th and I had sex with my partner the 14 of March, we didn't use protection or anything, plus he did came inside and then we had sex again like two days later without protection and he came inside again. We are trying to be pregnant, right now I've been having some cramps, and abdominal pain, also when I eat or drink something i just get cramps and then I feel nauseous out of no where. Oh and I'm supposed to get my period on Thursday the 23rd. What do you guys think I should? I want to take a test but I don't know if it's to early or not.