Daisy is right (as usual
Truly, forget about the exercise thing. I know you probably use it as a stress release but find another stress release. I had to do this when pg. If you must do anything then GENTLE swimming and I don't mean 15 laps of freestyle legs then 15 of freestule arms. I mean gently going from one end of the pool to the other kicking every second slowly.
Do not risk anything.
I love to exercise but heck I wasn't going to risk anything, best, THK.