I had sex during my period like every day three times a day n then i stop being on my period like in the third day after i stop being on my period i had sex and when he got off thee condom had blood on it so i went to go pee n this string of blood came out but that was it no more blood. After that day i started getting big headache n when i eat i feel like throwing it up hours after but i dont so is there a chance that i might be pregnant???