I gave up

I've been trying to conceive for about 2 1/2 Years. I've have sex 3 or 4 times a week since starting. I gave up last month and i was 2 weeks late for my period but eventually it came and it was light at first then heavy and it was short. Now. Im not sure when my next period is coming but it was due today. Ive been vomiting and nauseous i do not think i am pregnant but i am worried. i honestly think we should go see about fertility treatments because something has to be wrong with me.