Exciting But A Real Mistake Now

Last month my parents and I spent a week on my aunt and uncles farm. Me and my cousin who is a year older than me spent lots of time four wheeling.
One afternoon we ended up at one of their hay barns wrestling in the hay loft. I let things got out of hand and had sex with him.
Unfortunately being in the country I didn’t have any way of getting a plan b and I just found out I’m pregnant.
Our parents are going to kill us when they find out. I haven’t told him yet so not sure how he’ll feel about it.