Hi @Ann30567, I'm also 34 weeks pregnant and I've just stumbled across this but felt I had to comment. I hope things have improved for you since your post, and I'm really sorry to read how worried you are.
I wholeheartedly agree with the previous commenter in that your DP needs to be supporting you more. He needs to understand the impact of stress on you, but also the consequences of causing stress in any pregnant woman and how important positive mental health is during that time more than ever. You need to be protected by those around you, and from what you've said about your mum, mother in law and sister, they are just causing you stress and negativity and so your DP's responsibility is bigger than ever. Hopefully he can be assertive but tactful with his mum and deal with the calls to try to take some of that worry from you.
I've done a lot of appearing tough in the past, and sometimes it's a really bad idea because you're covering up your emotions and not communicating how you really feel about something - bottling things up for a long time is draining and frustrating and eventually I would always blow up, or break down! Please don't be afraid to show vulnerability to your DP. It's not just you anymore, it's your baby too 
Your mum and sister - it sounds like cutting contact may be best for now. Try to focus on yourself. Do you have others you can talk to or seek support from? Focus on doing things that make you happy. Surround yourself with as much positivity as possible - positive people, good food, try to exercise.
Moving house - you just dropped that in as if its not a big deal! Moving house is a huge deal on its own, let alone when you're nearing your due date!!
Have you moved yet and if not, will it be before your baby arrives?
I moved myself a week and a half ago. We've spent all our free time lugging things around, painting and decorating, carrying out home improvements, moving furniture, sorting and organising boxes, shopping for things for the house....and it's taken over our lives completely. Its taken 6 months to complete too, which caused a huge deal of stress and frustration. I wanted to have moved months ago, well ahead of my due date. Now we're moved in but I've got the stress of feeling the time ticking, feeling like baby could arrive anytime and I'm not ready; need to "nest" and annoyed that our stuff is all over the place and impatient because I want everything sorted out in advance as much as possible before baby arrives. Then there's constantly aching and getting tired from all the hard work of this all.
So I would say, please ask for more support from your DP, friends or anyone that offers to give you a hand on the moving side of things too, whenever that will happen for you.
Anyway sorry for such a long post, I hope you get the support you deserve and things look brighter for you, all the best of luck in the upcoming weeks