Yeast infection from plan b??

Took plan b 3 days ago and ever since I've had weird discharge and horrible cramps. Discharge is mostly like this and it's been A LOT and no smell or anything just thick and gross and yellow/green. I'm 17 and never had a yeast infection before and understandably would rather not have to tell my mom about the plan B or what's going on w my vagina so plz help me !! Tanks