35 weeks and never had this happen before

Brittany
I was at work went to the bathroom, stood up from toilet and for a minute straight I felt this weird sensation in my tummy, AND during that entire time I heard loud water swoosh noise at the end of the noise it sounded like a bubble pop. But nothing happened afterwards. No leakage. No water break. 3rd pregnancy never heard or felt that before. Again I'm 35.2 weeks