helppp!

So, i barely come on here anymore. but i do have a problem and wondered if anyone else is having something similar.
 - i had unprotected sex Nov 12. and got myy period Nov 29 - dec 3. i havent had my period yet. twice ive wiped since and there was a little bit of blood and never anything else. No matter how much i sleep, im always exhausted, i get full so easily and im so gasy. My headaches have increased dramatically, anything will give me a headache. and my mood swings have been out of this world. just laying here i feel like i have to throw up a little bit. please get back to me!