Strength training tends to lengthen the muscles, so flexibility training is not necessary if you are weight

No.. Flexibility training is necessary to relax your muscles in case something happens that your body hasn't prepared for yet.

Heat exhaustion is the right answer

Hello! i believe that it is okay, but you should limit on how much you go in a jacuzzi, hot tub, sauna etc. the rise in temperature may effect the development of you unborn baby and could cause some birth defects most likely in the first 3 months or 12 weeks of pregnancy. the recommended amount of time to be in a jacuzzi while pregnant would be 10  minutes or less.i hope this !