pregnant?

Sierra
Ok I'm 17 years old and I recently lost my virginity but me and my boyfriend have been going at it and the condom never ripped but I have a lot of symptoms that they say pregnant women have and I'm scared cause the last thing I want is to be pregnant. I would take a plan B pill but they say it doesn't work if you're already pregnant and if the fetus is already latched onto the uterus or something like that. I don't want to go to the doctor because I don't want to tell my parents I think I'm pregnant and they don't believe in abortions. What should I do? I CANT have a baby my senior year. Please help omg.