Could I be pregnant or what could it be other wise ?

Had sex yesterday morning and after about 5 hours went to the toilet after going after we had sex when I wiped there was blood in my mucus and then I wiped again n it was like when you first have your af on day one n nothing since but having period in the 13 th may I can't see it been pregnancy related even tho I've had belly pains and feeling sick tad emotional x