discharge

Okay ladies, I need some help. Lately my bf and I have been haveing sex more often than normal. We are trying to have a baby. My question is, I've been having a large amount of discharge and it has a strange unpleasant smell to it. Can I get some opinions on what it could be or what I should to help it stop or even decrease? It gets so bad sometimes it's like I had an accident and have to change my underwear a few times a day.