You have to see your doctor anyway for prenatal care see what they recommend.
Theres a difference of opinion on using Monistat while your pregnant. Some doctors say it's ok as long as its not used internally and some oppose it all together. Try to google is Monistat safe to use while pregnant to get some more views..
Yes, I agree with the above poster. It does sound like a yeast infection. These are pretty common in pregnant women and they can be passed to your partner. It is not an STD. Try the Monostat like the above posted suggested and if you don't see any improvement in a couple of days see your Dr. You both have to use this med and it can be bought at almost any store.
It sound like you both may have a yeast infection! which is caused by bactiera. I would either get check out at your Dr. or get some monastat at you local pharm. Good luck