might have a yeast infection

i think i might have a yeast infection. i’ve had a few before and i’m 16 and i forgot what they feel like when they start out. it’s really itchy and irritating and i don’t know what it is but it’s really starting to bother me. i had oral sex on thursday and today is saturday and i don’t know if that has anything to do with it. i don’t want to have to ask my mom to buy me mobistar again because i feel like she’d be suspicious of me and this guy, so i don’t know if you can buy it when you’re under 18 and i’ll feel embarrassed if anyone sees me buying it. advice ?