Me and my boyfriend had sex on Valentines Day and every sonce then I have been having headaches and pain in my stomach like crazy. I've also gained weight. When it was time for my period it didn't come until 2 weeks later and it wasn't even normal. I bled a little on Wednsday but half way through the day it stopped and Thursday I didn't bleed at all then the same thing that happened Wed. happened again on Firday. I have been having the feeling to throw up alot but throw up actually came out only one time. Me, my boyfriend, and my best friend started to believe I was pregnant so I went to the store and bought a test. I waited three minutes for the results and it came out negative but I'm still having these pains. The pregnancy quizes and google says they are signs of pregnancy but I think about the negative test and I get all confused..What should I do? Can somebody please reply to this because I need help.

Love,
*~Shay~*