Possible waters breaking at 19 weeks

I’m at the hospital now, waiting for a scan.

Just wondering if anyone has experienced this, sorry for tmi.

I’m currently 19 weeks pregnant with my 4th baby. My last baby was a 28 weeker.
Anyway, last night my partner and I had sex, during I felt slight pain and pulled away, he came out and I felt a small gush if fluid, thinking it may have been him, it wasn’t, we looked at the bed and there was quite a bit of fluid. I had to wee straight away, and then for the next hour (on the way to hospital etc) had the urge to wee again, I did about 2-3 big wees in that time which even though I’m pregnant is unusual for
Me. Anyway, they test my urine, no infection, had an internal look, no polling of any fluid, didn’t leak anything after wards, cervix closed. Now waiting for a scan to see how much fluid is around baby. They haven’t told me much only that it this gestation, their main concern is me and my health, not the baby. Did I wee myself and not realise? Could it have been my waters? I’ve had no pain, no bleeding, no more fluid loss.
Anyone have experience