ditto what .dalicia said. we can't tell you if you're pregnant or not. but yes, you could be. any time you have unprotected sex, even just once, there is a chance of pregnancy. all it takes is one time & one little sperm. first .response is pretty reliable, .i've found. i got a positive 3 days before my period was due.
but i also second .d's question.. if you didn't want to get pregnant, why'd you take the chance of having unprotected sex numerous times? especially letting him ejaculate in you?