I ve been having, I guess, a paranoia about being pregnant. I had unprotected sex in late February. In March, I had light spotting and I definitely thought I was having implantation bleeding. I called the medical center that I m with, and got a call back suggesting to take a pregnancy test every week until I got a positive, or a period. My period came a about a week late, and the response from the medical center after letting them know was that it was nothing to worry about. I haven t had any strong symptoms that typically connect to pregnancy, but I m afraid of being that person that finds out by the third trimester. Although, I ve heard that periods can reset , or change in abnormal ways, every ten years. If that s an actual thing, then it makes sense for my situation with the spotting, since I started my first period at age 11 during the Spring time, and now I m 21. I took a pregnancy test around March 14, and another one a week later. Both were clearly negative. My periods seem to have been shorter than I remember- instead being about 6-7 days, they ve been 5-6 days. I bought pregnancy tests two weeks ago, thinking that my last two tests might have been taken too early for an accurate reading. I used them the same day- all three tests. I drank enough tea to feel like I only had a slight urge to use the bathroom, and used all three with the same urine sample. All of them came negative again. Today is the latest possible day (day 35) that I should be getting my period. All I got at first was dark brown stringy mucus, and the rest has been very light brown coloring. Also, I ve just stopped to take a look at my abdominal size, and I seem larger in the stomach area! I have been training more for a half-marathon, but maybe my diet is throwing off my results. If I were to be pregnant, I would be at around 15 weeks. So my questions are: - is it possible that periods re-stabilize every ten years? - did I make a lot of wrong moves on how to go about my last three pregnancy tests? (Such as drinking fluid and using one sample for all?) - should I be getting help for my issue, or is brown mucus more common than I think? - am I likely pregnant (should I get a blood test or ultrasound) or am I just fat! Hah. Thanks.