In the last few weeks I have been super super nauseous (not a surprise, I have pretty bad healthy and am almost always nauseous, but it kinda seems worse than normal? I'm not sure), and I can't eat because I'll make food cause I'm hungry but by the time it's ready just looking at it makes me want to throw up; I've had sore breasts and I looked in the mirror today and thought my boobs looked bigger but idk if they actually are; I've had mood swings and cramps but I'm not on my period; mild headaches but I've also had a cold so I can't tell if they're causing them?; this last week I've had to pee I swear every half an hour, which has never been a problem and I'm not drinking anything more than usual ( I may be even drinking less than I should), but I read it can be a symptom of pregnancy.

I started the lowest dose of birth control pills about five days ago to control my hormones (period has been awfully irregular lately so my gynecologist thought we should try to smooth things out), and some of this might be side effects but it's also been going on since before I began taking them. 

I'm just really confused. I haven't seriously thought it might be pregnancy until today. Am I crazy or should I actually be worried?

I'm 17 and I religiously differ from my family so they don't know about my sex life. My parents believe in waiting till marriage to have sex. And I don't know if I even want kids, ever. So I really don't want to be pregnant, it would be awful to me.

I'm planning on going in about an hour to get pregnancy tests but I only have $10 to spend. Is anything under that price very reliable?

Sorry it's a lot, any responses would be greatly appreciated. Thank you!