HELP! Hemlock or hedge parsley?

NE Oklahoma USA. Backyard in an urban area.

I’m having a terrible time determining whether this plant is poison hemlock or hedge parsley (or a secret third thing???). My mower was temporarily broken so my yard got a bit overgrown. I’ve never seen this in my yard before though.

Found in my backyard late last night near my porch steps. I went back today and pulled half a ten gallon bucketful from nearly every section of my yard and barely made a dent.

Here’s where I’m struggling – some stems are purple and splotchy, some are green; some look hairy and some are smooth. Maybe it’s possible to have both but I obviously need to make a definitive ID ASAP.

I’ve found it mixed in with clover and dandelions, common vetch, henbit, and just on its own randomly. I haven’t found any that have flowered yet.

Thank you!