
For the most part, I didn't ever take deposits. It was too tempting to use the money and not have it to pay back, if that situation arose. It also meant I had the ability to back out if something didn't seem right with the new home!!
Taking a deposit BEFORE the birth of the litter? Alarm bells would have been ringing big time, especially given how much! And yes, I'd think it would jinx my litter too. I didn't even advertise an expected litter which I see people doing these days too. I'd take names and contact numbers to call once I had a litter on the ground - and even then not straight away.
I hope you can sort this out but this may end up being a lesson learnt - a very expensive one.
When I bought my Whippet, after 2 previous visits, I gave her a £100 deposit. She didn't ask for one but it made a kind-of stage payment for the overall cost.