I'm currently 12+3 and on holiday in a fairly warm climate. I've stayed quite fit and active during my pregnancy so far and do lots of mountain walking and visit the gym 4-5 times per week after checking with my midwife. I've just been for a gentle jog of about 2 miles, it's still fairly hot (about 26 degrees) but I took it easy and stopped when I felt I needed to. My husband doesn't think I should have gone and now I'm really panicking I've done something or raised my heart rate too high - I feel fine, had a cool shower and laying in an air conditioned room but now I'm panicking that I've overdone it!
I know opinions will differ on this but any advice would help!