confused?

i’ve had sex 3 times this month (no condom) i’m on the pill but have not missed a pill once or not taken it on time .. he pulled out each time (100% on time i’m unsure) should I be worried? a couple days ago I noticed i’m wet down there all the time and when I wipe its yellow (not discharge just faintly yellow) not much of a smell either .. I have an appt tmrw but I just need a piece of mind on what’s going on because not only do I have pregnancy running through my brain I now have this too