Firstly - get someone to make you a cuppa immediately! Put your feet up and grab some chocolate!
Secondly- although you are a mum to be- first and foremost you are a human being, an under an immense amount of hormonal stress right now - so fling any guilt away!
During my first pregnancy, I had a LOT of stress with baby's father... Especially toward the end! I can assure you, my daughter came out very calm, very relaxed and very content! She became fractious if I eer got stressed about things, because she could sense it, but the majority of the time she was content and very very happy!!!!
Your little baby WILL sense your stress right now and will probably know that something is not quite right, because arguments can be upsetting! But you will only make it worse if you dwell on it!
Just remember that little baby will have plenty of times where they know you ate feeling stressed or unhappy during their life! You are not going to spend the rest of their life not being stressed... So for now - try to relax and take it easy!
Perhaps when you are calmer you and your mum can have a chat and make everything right again!
Xxx