Waters breaking or semen??

So me and my partner had sex for the first time in about a month... About 5 hours later I have just woken up with a gush of fluid down my legs and on the mattress. It woke me up. As I walked to the bathroom it continued on to the floor. I am really unsure if it is my waters or semen? My stomach has made some big groaning noises since but no more fluid just yet. Anyone else ever had this?