Swimming is fine,
sex is especially fine, doctors will encourage you to have sex, as long as your not on pelvic or bed rest. And hot tubs are fine too, as long as its under 100 degress. I hear 98 degrees is perfect, the only thing you need to watch out for is if your water breaks, ive been taking baths and getting in the hot tub religiously, but I have stopped now cause im due in 1 day, and affraid i wont know when my water breaks, lol..