Morning sickness at 13 weeks?!!

So early in my pregnancy I was super lucky and never got sick. Now, I'm just over 13 weeks and I am getting sick frequently. (TMI I'm sorry) but now every time my boyfriend and I have sex, I feel sick and usually afterwards I throw up. He knows it's not him, but I can't help but feel bad. Also, the idea of sex, or sperm itself makes me sick to my stomach. Am I the only one?!?