After two years of tax exemption, does a J1 visa holder consider as a resident with the possibility to fill a jointly tax return when married?

I am a J1 research scholar and I have been exempt from federal tax for two years (Tax treaty with France). This two year exemption will end this december. I wonder if I will be consider as a resident next year (For 2018 tax)? And will I be able to fill a jointly tax return with my husband (J2 visa)? Thank you.