29week now had always difficulty in breathing

Omg my 37th week now and the breathing gets more difficult sometimes. Even heart pumping very fast and makes me feels even harder to breathe. like turning from left to right when sleeping I feel breathless. But if you feel like its really not normal and want a peace of mind, consult your gynae. Maybe taking iron pills might help abit but other than that, nothing much the gynae can do if its part of the pregnancy effect