Itchy down there

Hey so I had sex for the first time about a week ago and I got my period the day after and ever since then I’ve been pretty itchy in my vagina we used a condom. It doesn’t hurt or burn to pee down there and this morning I noticed a little yellowish discharge but I have no other pain or anything. Idk if it’s from sex, or my period or maybe the way I shave. So I was wondering if u guys know what it is and what I can do or buy to make it go away. Thank you!