Pregnant?

MY fiance and I had sex around March 8th. He came in me and we didn't buy a pill then once again March 12. I had my period on March 13th (i thought it was strange) No period since then but recently I've been moody and sensitive/ breasts are sore/slight cramps (period like cramps) after sex. Could I be pregnant? Cycle is usually around 32-35 days