Congratulations on your decision to start your family!! I am now 25 weeks with my third, and I was there in March at about 6 weeks, June at about 17 weeks, and I am going again in September around 32 weeks! I rode all the rides except for the mountains, Indy, and Matterhorn. Pirates, Haunted Mansion, Jungle cruise, all of those were fine. Basically I stayed off almost anything that had a height restriction, but since you've been before, you know what to expect.
I tried to drink a lot of water (June was HOT), but that was it. I lasted for 3 full days, and also had my 4 and 2 year olds with me, so you should be fine. DH did not go, and I was still okay. I go with a friend that takes her three kids also, ages 3, 3, and 1, so we are quite a group while there. I plan on taking it a little slower in September, but not much!!
Also wanted to say that
Disneyland is a great place for babies and toddlers, these have been some of our most magical trips. GOod luck if you can wait till they are 3 or 4, but if not, go and have a great time as a family!!!
Andrea