I'm a teenager, and I only started having sex and tracking my period last November. Since then I've had a regular cycle of 29 days. However, this month I should have gotten my period on the 21 or 22, and it still hasn't come. We only use condoms as birth control, and I've read that they fail fairly regularly even if used perfectly, and honestly, I'm inexperienced enough that it wouldn't be that surprising if I messed up. I've had some cramping that has felt like my period coming, but I have experiencing much more cramping that is of a lighter nature than what I usually experience. And obviously there has been no period. I took a HPT test and it came back as negative, but from what I've read a false negative is quite common, so I don't feel comforted at all.
I've pretty much written myself off as pregnant and am incredibly scared; I can't stop thinking about it, and I keep wanting to cry. I really have no idea what to do. I can't even contemplate telling my parents, and I don't know how I'll afford an abortion. A week late is a significant amount, and I've never been late before. It just seems likely that the cause is pregnancy.
Help! Any advice you have to offer would be extremely appreciated.