Sex during pregnancy

I am currently 22 weeks pregnant and I love sex but it has become really exhausting since I got pregnant. I get out of breath so easily during and feel bad about it and slightly embarrassed. Is this normal? Do you ladies have any suggestions. Im usually getting exhausted on top, which is what position my partner prefers during sex. At the end we both end up sort of unsatisfied and he ends up taking awhile to orgasm because we aren’t able to have sex the same way.