Will THC show up on a blood test?

I had around 5 hits of a marijiunna joint around 3 days ago, in 5 days my mom is asking me to go with her to get me checked for what shots i missed through a blood test, my mom said we can go any time but im keep telling her lets wait abit more im scared of needles(but actiully not, just trying to last longer)and she says lets go saturday(its in 5 days) i drink lots and lots of water everyday and im 15 years old i pee alot and its transparent, im really scared that my mom is going to ask the doctor also look for if i took any drugs and then not tell me, and they might find thc in it, i smoked around 5 hits throughout 2 days and half a ciggaret, im abit overweight and was wondering what i could do? Maybe tell my mom i dont wonna go but the thing is i need the checkup but i dont want them to find the THC, any help would be apprecieated

 

It depends, are you a frequent smoker? or was this a one time thing?

THC metabolities show up in blood for a maximum of three days. They can show up in your urine for quite a bit longer. Frequent smokers may average of up to 13days, but if this was a one time thing or like once every few months you should be fine.

 

I heard that it will only show up for 7 days, so you might just make it.

But i'm no expert, let's here other peoples thoughts before jumping to conclusions.

 

What macaroni said, you can got to most basic herbal remedy stores and they sell detox systems. Dont believe that Niacin shit and bleach thats all bullshit. I suggest this site http://www.Erowid.com to teach you anything you wan't to know

 

Peeing isnt gonna clense your blood. Do what other people said, i think its a safe bet you will be fine.