Vagina troubles🤦‍♀️🤦‍♀️🤦‍♀️

Me and my boyfriend have sex frequently.. like whenever we can get it in...and ttc so he usually cums in me. Lately I have had a terrible odor down there... and think a yeast infection is coming on, I’m also very very sore. I feel like every single time I have sex I get a yeast infection like a day later🤦‍♀️🤦‍♀️ and I don’t know why so then I have to go through the whole process and wait to have sex and it’s difficult when I could be ovulating and I’m wasting my chances or because me and my boyfriend get little alone time and when we do I have to be like oh I have a yeast infection... sorry🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️ I would prefer not to go to the doctor due to expenses... me and my boyfriend were both virgins when we had sex and I don’t have any thing other than this abnormal no bumps or anything. I really don’t think it’s possible it’s an STD so please don’t jump to conclusions I need factual advice.