I was gaining a few extra pounds and having symptoms such as moody, breast tenderness and fullness along with back pain.. I thought the weight gain was because I could be pregnant, but then I knew I was about to start my period, so I went out to buy a pregnancy test. The test came out to be positive.. Could this be accurate? I was suppose to start my period no later than the 17th, I took the test two days before that. So does this mean I am pregnant?

It's very rare to get a false positive. So congrats, it sounds like you're pregnant. :)