Am I pregnant or is my period spost to come?

....I'm 18...

Firstly, My period has alway's been irregular.

For October i never got my period. at the beginning of November I got it and then I got it again in November around the 15th.

Now it is December and I haven't had it yet. There is one thing this time that is VERY different from all my other periods.

I was a slow developer, I didn't get my period until I was 15. and I have had seizures since.

........This is what is going on right now..........,

For the first time in my life My breast's have been a little sore and it just happens then it would go away for the last week and a half. For the last 3 1/2 days it has hurt more and my bf said they look a lil bigger. If i put any pressure on it it will hurt. Next, Sometimes my stomache hurts, i think like 2 times I wanted to throw-up and all the other times it is fine. BUT if it does hurt, it goes away and a little while later it comes back and then goes away again for the rest of the day. This doesn't happen all the time. yesterday I was fine, this morning It hurt for 2 minutes and It seems perfectly fine right now.

My rib though has been hurtin for 2 days, on and off(yesterday and day b4) [I don't think this has to do with anything, I had a bike handle bar jammed into my rib when I was 10, went to the hospital and they said I was fine. And it is only my left rib. Like in the middle of it.]

I think I might be getting fat, cuz my stomache has came out a bit, and I havn't worked out since like September.

I am extremely confused because I have been having symptoms of pregnancy, but I looked it up and the Breast's hurting can also be for period. But I'm late by like 3 days, and I already took 2 tests.. Both negative.

...I think Something might be wrong with me?

...Is it my period or am I pregnant. Im extremely confused.. Me and my bf keep saying how are you not pregnant, cuz I have some signs of it but the tests are coming out Negative??

Please Help! We both are EXTREMELY confused and dunno what is goin on.

I have always hated my body cuz It is just weird....

I don't know if this has anything to do with anything but yesterday the middle of the left side of my head hurt, like a headache.