Okay me and my boyfriend had sex 3weeks ago while I was on my period. My period was gone 1 day after then I had a brown discharge, then a week later I felt really dizzy and mood swings, and kind of felt like throwing up, but now I don't I only feel tired, sometimes my nipples are soree and tender and I'm hungry all the time and have cramps like if I'm about to start my period though and he also has some signs he has had back pains and mood swings not being able to eat etc. is there a chance I'm pregnant?

Sure there's a chance but you wouldn't be feeling symptoms so soon.

I heard you can have symptoms as soon as a day after you conceive?