Discharge during sex , 6 weeks pregnant

I went to switch positions when we were having sex , then noticed 2 little white balls on his shaft. I know I'm std free. My husband's faithful as far as I know with no reason to feel otherwise. I plan on asking the Dr but would like opinions first. Can it be something wrong with baby? OR likely a yeast infection? I've had a yeast infection but didn't see little white pieces come out ever . Wtf? Btw no noticeable smell came from them. 
I don't think it's just cum... I'm pregnant w my 3rd kid I've had sex a "few" times lol