No sex drive

Aubrey
This is probably going to be TMI for some, but I'm not really sure who else to ask and get honest answers. I'm 19 weeks now with my second child. This time around, I have ZERO sex drive. With my first, I couldn't get enough, but this time I'd just rather sleep and would usually rather just not have sex. I feel so bad for my husband, he never complains, but I can tell it bothers him. I try to make myself initiate it, but then I just don't enjoy it. I'm not sure if it is because my nipples are killing me (sorry, TMI) or what.  I didn't have that problem with my first pregnancy either. I'm not sure what to do to relieve that pain either.  They feel raw, but aren't. Any suggestions for either issue? Thanks in advance.