Semen or Amniotic fluid?

Okay, so this is a little awkward, but my husband and I had sex when he came home today, and I thought the "moisture" felt different halfway through but didn't really think anything of it... When we got done I went to the bathroom then took a shower and got dressed. About 20 minutes later, I felt a big gush of fluid that was not pee. I changed my underwear, and since then I feel like I have more moisture down there than normal, but no more gushes. I'm 39 weeks pregnant... Maybe my water broke, but maybe it's just semen? I don't know. Kind of a gross question but I didn't think I would still leak semen so long after showering and peeing. I don't want to call the doc if it's nothing because we live far away from the hospital.

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