Could there be other possible reasons?

You need to talk to your wife about this. Pregnancy is a scary time. You worry about everything you eat or do impacting your growing baby add hormones and the craziness of the qorld its overwhelming. She is probably tired as well but women arent mind readers if u want aomething or need something tell her.

It isn’t unusual for pregnancy to completely take away sex drive. It happened to me both times thankfully my husband understood. Unless there is any other change that would cause your wife you need to not want intimacy with you, the you need to be a bit more understanding. There is no greater thing a woman’s body goes through than pregnancy. You also should be reported for that feeling to continue during the newborn stage too. It can take a while for the body to recover , for hormones to settle down, to get used to Brest feeding and the tiring demands of a baby. You need to be patient. You need to put aside your needs for the moment. Focus on being a dad and getting used to all that entails.

When I got pregnant the first time I didn’t want my partner and it lasted 2years I struggled a bit emotionally after having the baby and it caused issues in my relationship but we stuck it out and eventually it got better, and now are very affectionate and have great sex .

If she’s pregnant she’s got a whole lot of emotions and hormones going on. I know I couldn’t stand my husband so much as breathing on me when I was pregnant. Talk to her about how she’s feeling, ask her how she is. She might be feeling revolting and needs you to tell her you still want her?

Have you spoken to her about how you're feeling? Are you giving her loving touches that aren't an attempt to lead to sex (back rubs, hugs, holding hands when walking), or when you do these things do you get too excited and go a little overboard?

Could you ask her to schedule in a night that she can "help" (eg get naked so you can watch and masturb*te, or she can give you a bit of a handjob, etc)? That way she can feel prepared for it, it's not sprung on her when she's not feeling like it.

Your lovelife is probably going to be low priority for her for a while (including after baby is born) so it's important that you two learn how to communicate about this, and that you're both "good, giving and game" about sex and needs. That doesn't mean you can guilt her into doing something, but hopefully she can see it's important to you and she can find a way she's comfortable with to help get you off, and hopefully you can check on yourself that you're not pressuring her because pregnancy and newborn life is rough, and screws with hormones, and can make sex very low on the list of things to do.

Best of luck.

I'm sure she wants you but pregnancy can affect people in different ways. She might be tired, scared, achy, or afraid something might happen to the baby. Try to do something to make her life easier and be patient.