OK so my boyfriend and I had unprotected sex maybe about a month ago. And since then I have had more frequent urine, I've been really tired all the time, I've been getting headaches a lot more, my eating habits have changed a little bit I'm not hungery as much as I used to be, and about a week ago I had this weird period that only lasted a day, and I just contstintly feel bloated... I don't know if its just me cause I'm nervous or not but I'm supposed to hit my period this week but what kind of syptoms would I be experiancing in the first month?

When I was in college, the professor indicated that the following are early signs of pregnancy. Not everyone has all of the symptoms.

1. more frequent and urgent urination.
2. breast changes -- the nipples darken slightly and become tender.
3. emotional changes are common.
4. cravings (in eating) are common.

Sometimes there will be some bleeding, but it's not usually as extensive as a real period.

Nothing about headaches that I remember.

Since your last period was off, and you are experiencing possible pregnancy symptoms, I'd take a pregnancy test... or you can wait until the end of the week and see what happens when your next period is due and test at that time if need be.

Just to add to what Perito listed... some women will be more tired than usual, some will experience headaches, some will feel as though their period is about to start anyday... maybe slight cramping and/or backache. Often the signs can be similar to what you might experience prior to a period.