Sexual based question

mooshie

Me and my boyfriend were getting it on and we began to have sex. Now part way through a lotion like thick white substance started to drip from my vagina. Now I have no idea what this means as it has never happened before. There wasn't any itching or burning or any kind of discomfort when it happened either. Also we always use protection idk if that helps at all. I was just wondering if anyone else has experienced this or knows what it is. Thank you ! Xx