My mother stresses me out!!

So long story short, me and my mother have never ever seen eye to eye. For as long as I can remember, we have always disagreed on something. I'm 31 weeks pregnant with our 2 baby and I'm very emotional and I wear my feelings on my sleeve majority of the time this go round. When we found out we were pregnant with our 1st things between me and my mom began to get better in a sense, there will always be those disagreements that all families have but they didn't seem to be as dramatic I suppose. She helped with everything with our son from baby shower, buying me maternity clothes and so much more for him. She was very involved. After he was born things began to go down hill again and things between us went right back to the yelling and screaming. Well my husband and her do no and I repeat DO NOT like one another. Family functions are very tense and stressful to say the least. Honestly I don't know why she hates my husband so much, besides the fact that his mouth tends to get him into trouble and things that were said on both sides really should not have been said! My husband was standing up for me and words came flying out like vomit and it was too late. My mother is the type that doesn't like to be told no and is very I'm always right and has never had someone stand up to her and my husband had enough. So I don't blame him for doing what he did, because it was in a way of protecting and standing up for his wife! So this pregnancy has been very different, she's not as involved, she hasn't bought anything for this baby, she just doesn't seem to care much about it. So of course it bothers me but I don't say anything about it because I don't want to cause more fighting between us. I hate talking to her because my hormones are so out of wack and I'm scared to death that she's going to put me into labor if I talk to her. I hate to be that way but when I see that she's calling, my anxiety goes through the roof and it's always an argument regardless of the situation. I don't know how to tell her without upsetting her! I just need to get through this pregnancy without stress and it's very very hard with a mother like her! I flagged this as anonymous because I don't want things to get taken out of content. I love my mother and always will but I can't stress anymore over our relationship! Please comment if your going through the same or something similar! Kind words please!!!!