Girls, i need some genuine help!!

So me and my boyfriend of 2 years have been trying to conceive since October last year. I know that it takes time, depending on the people. However, I’m getting concerned because whenever we have unprotected sex, and he finishes inside, a few days later, I start to leak out of my vagina, with a white smelly discharge. I had no idea what it was at first and just put it down to general discharge, then realised after not trying for a while (like during my period, or just not having sex for a week or so) that it only happens when we’ve had sex. Is this normal? And just as reassurance, can it sometimes take a while to conceive?

I’ve been thinking about going to the doctors but I don’t think there’s much they can do about it, or can they?