So I am 17 years old, and I was spending the night with my boyfriend and his friends for two days, and we had sex several time within those days, and one was in the shower without a condom ( he doesn't know if he precumed or not ) and then we used a condom the other time and then there was a moment where we did it for a minute or so and then he put a condom on. I got a sharp pain in my lower back near my tailbone today but it hasn't done it ever since, and my breasts are a little sore , nothing major. And then I have been having stomach pains , and pains near my upper vagina , and I haven't started my period yet which doesn't come for however long , I get sick to smells. I know it's too early to tell, but am I pregnant? Help.