tbaygrrl

I too became pregnant after we started the k-1 process. The visa process is stressful enough, let alone while pregnant and seperated from your partner. Here's my opinion. I would continue searching for a co-sponsor or have your SO search for a 2nd job (though with school but do-able if determined enough). For yourself, bank on staying in Canada for your pre-natal care and delivery. This way, you don't have to worry about finding health coverage here in the US. Under the new health care bill, health insurance companies can still deny a pregnant woman care (calling it a pre-existing condition) until 2014. So you may have problems finding care in the US while pregnant if insurance companies won't accept that you were covered under CND health care prior. Confusing I know.
But for financial reasons, as this seems your largest issue, have your maternity care and delivery in Canada. All your spouse would then have to do is register a birth abroad for your child. THis will enable you to get a US passport for your child.
I hope this helps and congrats on your bundle.

If your ex-family is in Ontario, you can either use a Lawyer or check out the yellow pages for the city you need to have it done in for Notaries, as they will advertize. It will be easy to find someone to notarize a document, just call around for price comparison.
Cheers