Miscarriage. bleeding. BC pills

Hello I'm a 17 year old about to go off to my first choice university, I'm in a healthy relationship with a guy I've been with for 2 years and have sex regularly. However I had my period starting December 2nd and ended December 6th it was very light with no cramps which is abnormal for me. i had sex with my boyfriend December 7th, on December 8th the bleeding started again now December 20th I became very dizzy while walking to class i have also been very emotional and tired after constant light bleeding with no cramps and little to no clots I bled through a super plus tampon within an hour and a half of putting it in. Upon removal I had heavy bleeding and large clots. I suspect I am having a miscarriage, but I am scared to go to my parents with them being rather strict and I don't want to alarm my boyfriend with anything false. I work 12 hours a week average. I have been on birth control for 6 months and take it regularly. I also use condoms around 90% of the time. I don't know what doctor I could go to, with it being so close to Christmas i am very short on money and can't afford much. Please help me I am very scared