Hi T.,
Pregnancy is an emotionally hard time. In my experience (5 successful pregnancies, kids from 14 to 2 1/2) men don't really understand how the stress, uncertainty, hormones, worries, etc. of pregnancy affect women. It is not that they are insensitive oafs, it is just that they have never been pregnant. If you have not discussed it with him, your husband probably has no idea he is hurting your feelings with this information. If he was a kind and loving man before you got pregnant, he probably still is. He's probably trying to be helpful, or supportive, or even involved in the pregnancy. You may want to try just getting yourself into a good place emotionally (which can be hard when pregnant--maybe after a nap?) and choosing a low stress time when he is in a good mood as well, and just having a non-confrontational, non-accusatory, non-defensive, upbeat, honest, and SHORT conversation letting him know that you feel defensive or hurt when he compares you to his friends or any other women for that matter, especially while you are pregnant (blame it on the hormones if necessary), and asking him to please try not to do that, thank him if he agrees to try, and give him a hug and kiss and move on.
I'm all for exercising during pregnancy, but it should come from you and only you can know what you are feeling up to. Sounds like you have a lot on your plate already and probably need rest more than anything else, especially going into that last tri-mester.
Good luck, I hope you get the chance to slow down once the baby comes so you can enjoy him/her. By the way, there is no such thing as bad timing. A baby is a miracle whenever you are blessed with one. We just had our last 5 years after we thought we were done. My husband was scared to death. It has been wonderful for all of us.
K.