I am 18 years old, and have been with my boyfriend for over a year now. We have been having sex since October, And used a condom every time. Since like January or February we have stopped using condoms and I am not on birth control. He has reached that climax point, but not inside me. Only pre-***. My periods are irregular, and I haven't had one since the end of February beginning of March. I have been very nauseated, but not got to the point of vomiting yet. Sinsitivity to smell, urinating a little more than usual. I was constipated for a little while but now have diarria, and have had serious mood swings. Could I be pregnant?

Yes you could! Even just using a condom isn't 100%, so you can probably imagine that the withdrawal method isn't very reliable... you need to get yourself a home pregnancy test or get yourself to your doctors for a blood test (very accurate)