Trouble with Sex

Kara • A mother of four children and three babies in heaven! My hubby is a Over the Road Truck Driver.
I need to know if others experience this! Today my hubby and I tried to have sex. I couldn't let him finish cause it seems my lubrication was very watery and not providing a barrier or very much lubrication. I've never had this problem. I'm six and a half weeks pregnant. And I'm feeling guilty about makong him stop but we've had two miscarriages and an ectopic pregnancy in our first 11 months of marriage. So I'm struggling mentally. My husband is a heavy man and I love sex with him but I feel the need to protect the pregnancy even though the doctor says it will be fine. Please has anyone else experienced this issue of watery juices?