5 days late on my period had sex the wednesday before my period it was supposed to be here on sunday. Took a test sunday came back negative. Had sex Monday Tuesday & Thursday of this week. Have been experiencing nausea, fatigue, hot flashe, & backaches. Not sure if i should wait to take another test or just wait to get my period. My period is very irregular. I don't when i ovulate or when im actually am supposed to have my period. . I dont know what to. Me & my SO have been having sex with any protection since November of 2012 & nothing has happened. Is there a chance this could be it? When should i test again? Im just anxious to know..