I had unprotected sex on 1/1/15 and both him and I don't remember if he pulled out. I am on birth control but I took my ring out and left it out till the next morning at like 5am. But recently I have been getting very nauseous at everything. I know its not the flu because I had that recently too. But I'm supposed to start my period on the 13th. Should I wait to take a test? Or take one now?