My PMI was not on my 1098, then I rec'd a revised 1098 after I filed my taxes, can I take the deduction next year?

No, you cannot claim your 2017 PMI in 2018. If the addition of the mortgage insurance deduction would change your tax liability, you'll need to amend your 2017 return.

Please read this TurboTax FAQ to determine whether you need to amend your 2017 tax return:

https://ttlc.intuit.com/replies/6749144