First symptoms of pregnancy

My boyfriend & I have sex....all the time! I just recently started depo like 2 weeks ago. But the week i was suppose to let it absorb into my body we had sex. And he finished inside me atleast 6+ times. Now that its about 3.5 weeks later im starting to get sick over any smell that i used to like. Id wake up in the middle of the night sick. and my boobs hurt extreamly bad.