Unprotected Sex 12days ago, Flu like symptoms, now period a week early?

Hi im 19 and my boyfriend 24. We had unprotected sex on 17th April. Im not on the pill or anything i normally use condoms. He stopped

and pulled out in more than good time, i finished him off. On 27th April i woke up with a mild dull ache all over my body mostly my kneecaps, stomach, lower back and head.

I went to see him again on the night of the 27th and we did it again unprotected and he came as soon as he pulled out. On that night my body started aching so incredibly badly i was moaning all night, i couldnt sleep at all and i could barely move coz my head would bang and bang. I also had dark diarrhea at his.

I went back to mine and just kept falling asleep and waking up and falling asleep.

Now yesterday 29th April i was at home and i was resting on the sofa and itwas mostly my stomach and back that was bothering me. Like sometimes so badly i curled into a ball to make the pain go away. When i stood up my head would be dizzy for a few seconds and then just go back to intense banging.

I also had to go to the toilet alot but mostly for a watery no2.

Early in the morning of today (30th) i came on my period. Its exactly a week early if i calculated it right. Its supposed to come next saturday.

Today the pain is most prominent in my back stomach and head again. Toilet habits havent changed except for the blood. It looks pretty normal on my pad but darker on my tampon.

Ive searched all night online for answers and they all say different things: you could be pregnant, its not pregnant, its probably stress from being ill.

Im so scared, has anyone have answers?

I would go to the doctor but there closed for the Royal Wedding. I dont know whether i can get a pregnancy test because walking is so painful.

Please help x

BTW sorry for the over the top info i just wanted to put everthing thats wrong with me down.