Please help I’m going insane!

So my daughter is just shy of 2 1/2. She was showing signs and interest in the potty so we figured potty training could start. This week is week 3 of potty training. The first 2 weeks were going great! To the point of no accidents day or night. Now all of a sudden she refuses to use it. Been almost 4 days with regression. She has had only 3 successful pees in the potty in this time. I don’t get it. She was doing so good. Nothing has changed for her lifestyle. Routines are the same and no major changes since starting. I’m going nuts. I’m pregnant with #2 so exhaustion is killing me on top of dealing with all of the accidents. I almost want to give up. Anyone know how I can redirect her or tips on how to deal with this?