I definantly think this is a hormonal thing. I am totally the same with my husband when I am pregnant although he doesn't do what your partner does. I get annoyed at him for the smallest things like throwing his dirty clothes on the top of the washing basket instead of lifting the lid and putting them in. Some people would say this is a petty thing to get annoyed about but when I am hormonal WATCH OUT!!!
My advice (if you want it) is to try and just grin and bear it. Try and look on the positive side, he is obviously interested in your baby and your pregnancy which is a great thing (even with the annoying bits!).
4 lovely munchkins DD 10/03, DD 03/05, DS 10/06 &