spotting and abdominal pain after sex during 5weeks pregnancy, is bad?

i dont know if im just scared or im already being paranoid but please help me. :( i had not have an intercourse with my boyfriend but when we are both arroused. he slowly wiped the end of his penis against my prepuce but reached down til my clitoris and vagina. im afraid he might have been able to erect a sperm when he was able to place it on my vagina. would it be possible that i get pregnant? because  last night, i slept early. it was about 9pm where i usually sleep bet 1-3am. then right this morning i felt backache and my lower left abdomen is quite  painful. even my stomach didn't manage to calm itself. instead of vomitting, i ended up move bowel. abother is if its already dawn when i wake up. i would feel very cold that i even use to cover my whole body with blanket but just awhile ago. i feel my body hot that i dont even need a blanket though the same coldness is in. are this signs that i am pregnant? please help me. :( i cant have a child this early because our family culture is to be pregnant only after 25 years of age. i dont want to be called a disgrace of our family and also. may parents are very strict. please? help me to find also some ways to get rid of it. :(

M almost 4 weeks,had intercourse last night,heavily......n when I went to the bath room I found mu tissue red after urinite,now m worried there a no pains,,ns it seems to stop,,worse iv had 2 miscarriages,b4,,,,should I worry?