Hello. Me and my fiance had sex about 4 weeks ago. It was the first time we didn't use the "pull out method". I later checked my calender and found that it was a few days before my ovulation. We don't use any birth control. Two days after i had a strong feel about being pregnant. So 14 days later we took a test which came out negative. Few days after the test, i had my period. It was a bit less than usual though. But now i start to wonder... im having headaches, been having slight nausea which goes away after a few minutes and ive been feeling exhausted lately. I dont diet or excersie at all but i lost centimeters everywhere exept my tummy, which is weird. On the scale i was 1.5kg heavier. I have a lot of gas for no reason and my belly seems strange. I get dizzy everytime i stand up. I feel hungry all the time. (The first few days after sex, i couldnt stop eating carrots) I also have light abdominal cramps like period cramps... please please please can someone help me figure out...??