Hey girl all I can say is get a pregnancy test, thats the only way u will know, but yeh sometimes that happens to people when they get pregnant, me on the other hand am 2 months pregnant and I havent had anything like that, but it is pretty common for some people to have when pregnant, and also it could also be the birth control thing, I was on birth control for a year and I went off of it and months later I had some weird periods, I had missed 2 in a row I thought for sure I was pregnant, so I went to the docter and got checked out, and I was fine I wasent pregnant, it was from the birth control my body was still tripin, so I dunno girl just get in to see your doc, hopefully if u are preg u are readdy, im 19 and yet dont feel ready, but I know ill be able to do it, so im happy, so hey good luck, let me know what happens,
your friend jessica :p