Cervix Check, Now Contractions?

Emily • 25 / Married / Mama to Maddox (2009) and soon, Elijah (2016) too.
I'm  36.6 today, had my prenatal at 10AM. She said I'm 70% effaced and 1cm dilated, felt his head. It's now 6PM and I've been having contractions since about 330/4. However nothing in regular intervals just yet, but definitely painful enough to knock the wind out of me during each one. I know she didn't strip my membranes, but I was wondering if the check could've just seriously irritated me and is causing these contractions? Has anyone gone into labor after a routine check?