Im 33 weeks pregnant and and some day i feel like my pulse is fast or i feel like i need more oxygen and that my breathing vari. is that normal? thank

Reason for follow up: The abdomen expands, pressing on the diaphram and giving feeling of not being able to take a full breath. If someone's got lung disease this can be bad; mostly just feels bad. Pregnancy increases strain on the heart. And, a huge number of (generally OBVIOUS) serious conditions can cause symptoms of strain on the heart and lungs. These are what are (always) screened for in (every) obstetrical visit