Toddler using toilet at nursery but refusing at home

[Notaclue01]

Hello, looking for some advice.
My nearly 3 year old has been pottery training and is successfully using the dinky toilets at nursery and having few accidents. At home however she is refusing to use the potty or the seat and step we have on the toilet. She is holding in poo and wee and getting very upset when she finally has an accident because she can’t hold it anymore. We’ve tried bribery, being soft and not pushing her and also being a more direct and telling her she must sit on the potty or toilet and nothing works.
Anyone experienced this and have any advice?
I’m 37 weeks pregnant so getting a bit desperate to try and nail this before I don’t have as much time on my hands.