I think I'm possibly pregnant and it's hard to tell.?

My period was due March 12th. I put in the nuva ring March 2nd. I've been on it before. I had March 6th and my bf came inside me. No leakage after . I've been cramping that next week and had been cramping since then. I took the nuva ring out Sunday (the 22nd). I felt really tired that day and today I still cramped, and my left was sore, it had a pain in it for like 30 seconds. Could I be pregnant?