Hey! Schools like western and queens for an example look at 2 years worth of marks. You still have 3rd and 4th left to go - do super well in those! Plan your courses out! Be informed!
After your 3rd year you can decide if you want to take a 5th year or do 2nd undergrad like you were mentioning or maybe even plan for a masters before med. The world is your oyster dude.
You should check if med schools take summer courses into account, every school is different.
Also so don’t feel discouraged, keep working hard, you got this!