Pregnant lady obviously will be more irritated due to extra inconvinience and her hormones could play up too. You should understand this and not blame her. If you see tantrum just dismiss that bs, let her steam get off.
Tell her that you can forgive her unacceptable behaviour and that you are more concerned about wellbeing of a baby rather her temporary discomfort. There is no need to be doormat just because she is pregnant, but at times you have to give in too.
My wife wouldn’t clown about with tantrums as I wouldn’t take that too serious. There are more important things to worry about, quality sleep, massage after hard day and beautiful things women like to hear.
People are different, so it may not work well with mentally unstable ones … but then you do get early sign message of being with a nutter.
If she is one of those mental cases and behaved like that through pregnancy, you made wrong choice … your baby will be unstable and shouty too. Kiss good bye to your peaceful sleep.
😀