I am coming out of a cold from the last two weeks. I am a female, I am 20 years of age, I am 230 lbs. or so. I have had a headache for a week straight. My headaches usually are really heavy and cause my to throw up letting me know that I am going to start my period. I had my overlap period in January 27 to February 3. I did have sex on the 14th of February and have not had my period for three almost four weeks. I am twenty and when I had unprotected intercourse the man I was with did not ejaculate. Should I be worried? I do not have the symptoms of pregnancy. I am also slowly getting better from a nasty bug cold for two weeks. I did have feelings of overheating but have had a headache for a week straight. However, during before I start my periods I do notice that I get very bad headaches to the point where I am throwing up. What should I do? I took two DIY pregnancy tests and they came up negative. Should I be worried? I have also been taking over the counter Ibuprofen but that is all.