so. I just coughed and felt a pop. no leak of any fluid but I am having mild tightness across my…

so. I just coughed and felt a pop. no leak of any fluid but I am having mild tightness across my stomach with some pain but can't tell if it's my son moving across my stomach. has this happened to anyone? what was your outcome? I'm scheduled for a repeat c section on May 15th, but my ob said i would be okay if I went into labor on my own.