Weed problem? Help! 😱

So I was at my best friends house today and she isn't a regular weed smoker or anything so I had no reason to suspect that there would be weed in her house. Especially since her mom is so against it. Well, when I got there, I headed straight into her room to dump my coat and purse (she was on the kitchen at the time) and I saw a Tupperware container of cookies on her desk. She usually puts snacks there when they're for us to eat, so I snatched one and ate it (they were really small so it only took a second). Affer that, I carried on with her and about thirty minutes into us hanging out, I start to feel really weird. I started seeing weird colors and shapes and couldn't feel my face and it got pretty bad. I started panicking then because she asked if I ate a cookie and I said yes, to which she told me that they were pot cookies. I don't usually remain involved with stuff like that, so my tolerance is very low, so I panicked because I had to be home in four hours from that point. I had only smoked twice in the past, the last time being four months ago, and I've never been that high even though I always give myself at least 8-12 hours to get back to normal except I didn't have that. And the worst part is that I have to get my blood drawn in 4 days. How do I get the THC out of my system? I'm 16, can the doctors tell my parents if they find THC in my blood? I don't like how I feel and I don't want to get in trouble. I'm a good kid and my parents would be so disappointed if something like that happened, even though it was by accident. I'm really worried and I need help. Please tell me how to get rid of the THC! I've never been in this position before and I'm really scared! 😭