Yes, you can use TurboTax and file married filing jointly. See below.
You do not count the days for the 5 years or part years that you were on an F-1 visa. The days during that time are called exempt days, meaning exempt from the substantial presence test.
You count by years. Even one day in the US on an F-1 visa counts as a year. So you were exempt for 2014, 2015, 2016, 2017 and 2018. Starting January 1, 2019 you start counting your US days. As you were in the US 183 days or more, you are a US resident for 2019 and can file using TurboTax.
You can file married filing jointly by making an election to file jointly with your nonresident spouse. Please see page 9 of Publication 519 on how to make the choice for Nonresident Spouse Treated as a Resident. You will need to sign a statement and attach it to your printed return. You cannot e-file.
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