Yeast infection or STI?

Lilith

so basically my boyfriend came over a few days ago and obviously we had sex. there was a little bit of blood that night but i just put a panty liner on and called it a night. figured i got another period even though i had one not even two weeks earlier (after being on Nexplanon and not having one at all for about 4 years. i get it taken out next year).

the day after i got really bad itching down there and i’m pretty sure it’s a yeast infection. my main concern is that this is the worst yeast infection i’ve ever had, and i’ve had 3 by now. the itchiness is unbearable. however in my past infections i’ve never had ANY bleeding, let alone how bad it is now. it’s like a really heavy period, but i’m not experiencing any other period symptoms. i’m worried my boyfriend gave me an STI because it hurt a bit during intercourse and now i’m itching and bleeding heavy.

has anyone else experienced a yeast infection either really heavy bleeding or do i need to have a talk with my boyfriend???