Okay, so in October, November, and December I had about a normal 28 day cycle for those 3 months. I missed a period in January, took a pregnancy test a week after I missed my period, but it came back negative. I tested 3 days later and the same result. So i just figured it was a weird month and I'd start in a week or two or maybe I'd just start back up on schedule in February. Well, January is over with and now it's February 7th, and still no period. I should be starting around this time if I was going to start back up on schedule, but nothing. I'm really not stressed out, so I don't think it's stress. Also, I had some spotting on the time my period was due in January, but it was only when I wiped and it was pink/brown, never enough for even a panty liner. I spotted a few times randomly throughout January, and a little bit yesterday and today also. I'm planning on taking another test next week, just to be completely sure but I don't think I'm pregnant. What else could cause these missed periods?