I haven't a clue what to do... pregnant?

Hello.

My husband and I decided that we wanted to start ttc...however since this would be our first child, I'm new to the whole "counting days".  My LMP was 5/25 and it only lasted 4 days.  Last Wednesday I had a dull headache (one that hurt all over not in a localized area) and nausea in the afternoon.  Since then my head still hurts some days and the nausea seems to come during the late afternoon and early evening hours, I never throw up but my mouth fills with saliva and my stomach churns.  I have noticed certain smells that my husband says he cannot.  I noticed on Friday that my nipples were terribly sore...that being said, I usually have tender breasts before my period but this is a different feel, I almost cry every time I put a bra on or take it off.  I noticed this morning that the veins in my breasts were showing very vividly and yesterday morning I had to pee around 4 times in an hour and a half ( I had only had one glass of soda all morning).  I haven't noticed any spotting but I do have cramps and have found myself crying at the drop of a hat.  I have taken hpt but they continue to come back negative.

I told my husband that it's probably just my hormones and my period coming early but I am a very VERY regular individual when it comes to that...I can almost tell you the time and day that it will happen.  We had sex almost every day last week (my highly fertile days), of course unprotected.  I don't want to get my hopes up and then be let down but it's so hard.

Somebody please help and give some advice.