pregnant cow

Hello all, I have a pregnant cow that should be due any day now. I was wondering if someone could chime in and tell me when to really be "bird dogging" her. I know she's due in April but need help narrowing it down a little. So far she's really bagging up, she's awfully swollen in her "lady...

I was wondering if I needed to add any loose minerals to my 5 year old jersey cows diet. She is due in about 4-5 weeks. I currently have a mineral block she visits regularly. My question is, do I need to add loose minerals to her diet now or after she calves? Thank you all for your advice.