Pregnant women are now exercising as frequently as non-pregnant women and there have been some welcome changes over the last 25 years in terms of what degree of exercising is suggested.
The old mantra of maximizing your exercise intensity by limiting your heart rate to 140 beats per minute was abandoned nearly 30 years ago! Too many medical providers unfortunately still repeat it.
The current up-to-date recommendation is to exercise moderately at least 30 min per day. You should judge the max intensity by always being able to have a conversation without being out of breath. Hydrating well before exercise, and staying away from contact sports as well as downhill skiing and scuba diving is important.
Be aware that your balance may be a little off due to the pregnancy related weight increase, and hormonally induced joint softening, so be careful. Prenatal yoga is an excellent way to stay in shape. Again, remember that the “140 rule” does not apply anymore.