Sex during pregnancy (or lack thereof)??

This is totally TMI but don't know who else to ask. I noticed that my hubby's sex drive has diminished since I got pregnant especially now that I'm showing more. I get that it may be weird for him but I wish he would just say that and I would totally lay off of the subject. Have asked him many times and he denies that it's weird for him but just keeps coming up with excuses/reasons (ie: he was sick two weeks ago then I was sick all last week with a bad cold and now he's sick again!) It's been about 3+ weeks that we have been intimate and it makes me feel insecure and unwanted. We have been married for 1.5 years and dated for 6.5 years before we got engaged and 8 before the wedding. We have never had an issue with sex before (didn't live together before the wedding) so hoping it will go back to normal soon. Anyone else in this situation? For the record I know he's not cheating or getting it anywhere else just makes me feel rejected.