Pregnancy and dogs

Hi! Recently found out I was pregnant and within this last week my Great Dane (3ys) has started attacking our other dogs when they come near me. Any idea on what will help? She’s my first “baby” I rescued her out of a terrible breeding situation and would love to find a solution with having to rehome her but currently she’s outside during the day or locked away from the other dogs as she’s drawn blood. I know it’s only been a week but still it’s not something to take lightly.