TMI!! Can anyone tell me what this is???

So if it’s important, I just finished having a yeast infection about 5 days ago and I no longer have any burning or itching. My bf has been in quarantine for about two weeks and when he got off I went to see him and we had sex. He finished in me twice. This happened 3 days ago. It started out as a light pink discharge that was super watery and it was a lot of it so of course I thought I was pregnant ( we’ve been together for 6 months and we have had a lot of sex ) so about 10 minutes ago I took a pregnancy test and both came out negative (AMEN) anyways the discharge slowly started changing to this yellowish-greenish discharge and I don’t know what it is. Of course I’m worried that my bf has cheated on me and gave me an STD because before all of this I was completely fine, I only started having weird discharge after we had sex. It’s a lot of discharge and it keeps ruining my underwear so I’m going to schedule an appointment with my doctor to see if I’m clean. Until then, can anyone tell me if they know what this is????!!!!