OK I have not had sex since February 9th. March 4th right on time I got my period but it was only about 2 1/2 days long instead of the normal 5. I had just stopped taking a birth control pill that id only taken for a month. I took a HPT just to make sure and it came out negative. I was suppose to start my period yesterday and I didn't, and I have always been regular... I took 2 more HPT yesterday and I got negative results again. I have 2 children so I know what it feels like to be pregnant. The only symptom I am having other then missed period is cramping.

Most likely you are not pregnant. Although you only took the pill for one month, it was still long enough to throw your period off kilter for a month or two.

Even the most regular woman has an "off" month once in a while. Such things as stress, diet change, change in exercise routine, etc. can throw your period off a few days and/or make them shorter and lighter.