Hi LG

This has happened to me as well, more in the first trimester than now but each time it is a terrifying feeling.

For me it is just something that happens when I bend down too much or lift anything heavy. My scans come back normal each time, bubs is growing and moving lots so I have been told to not stress about it (hard to do!) and not do anything that triggers it.

You have done the right thing by speaking to your midwife, just follow their advice and go and see your ob if it gets worse.