TMI warning (ish)

So...my boyfriend and I were having sex (which bc we’re both so busy, is rare at the moment.) I have recently stopped being able to feel very much in my clit when I’m riding him and today was one of those days. We both got really sad but it felt good after he started to trust really hard. We felt nothing after and talked for a moment. I was going to sit up and take him out when all of a sudden a pool of (cum?) came out. I got so scared because I’m currently not on the pill and he told me he didn’t even feel anything. Neither did I. It was thin, and like a brown colour as if a bit of blood touched it. It smelt awful! Has my boyfriend cum inside of me or is it a liquid from me?