Any answers

I've had unprotected sex on the 25th and 26th of February I was expected to ovulate on the 28th of the month and today is the first of March and I'm having bad cramps not as deep like period cramps but they aren't pleasurable..my period is expected to come on the 12th or 13th of this month and I bought a first response test how long should I wait to test.? Is these cramps too soon for my period? Any help would be appreciated