Something isn’t right...

So I’ve been having all the common small signs I’m pregnant so I’ve had that on my mind then last night my fiancée is talking bout how he has always itches since like 4 years ago when he slept with his gf at the time (before me). He started looking at stuff online bout having a std. I was tested in December for std’s and I was clean and everything is fine but now I notice that I have a itch every once in awhile around clit and one other place so my question is is that normal? I should half found out if I had anything back in December right? Fiancée said he has itched since before we started dating which is true but wouldn’t I know from being tested if I had something by now? Please help me!