Anna, you might get a better response if you can specify your zone and general region to help narrow things down. Good luck.

Anna theres a plant identifier app. It looks decent by its reviews.

There's a dedicated plant identification forum here on garden web. Name That Plant Forum. It's frequented by humans who have proved far more accurate than any app.

Meanwhile, have a look at Cyanchum rossicum. Since you're in NE USA that could be it. And it's not something you want.

But please post on NTP. You'll get a lot more answers there.

Thanks so much for the help! I posted this in Name that plant