I am 17 and my boyfriend and I had sex on the 15th and 16th of December. We used condoms and he only came once. My period is on a 35 day cycle, so it should have come the following week (the 19th through the 24th). It is now the 27th and still no period. For the longest time I didn't even feel the normal period symptoms I get, which are cramping and mild fever, sometimes even headaches. So I finally started feeling minor cramps on the 25th, and now they come and go every once in a while. I also have a low grade fever that goes from 99 to 100. I took a home pregnancy test on the 24th, thinking that my period was on a 28 day schedule and was a week late. The test came out negative, and I'm thinking it's because I took it too early. I am now waiting for my missing period, and am waiting until the end of the week to see if it will show up, if not, I am going to take another test. I am not on any hormonal birth control, and unfortunately did not take any emergency contraceptive as a precaution. I am now anxiously waiting what will happen. Although cramping eases my worrying mind a little, I also know that it can also be a sign of pregnancy. Do you think I could be pregnant?