Grape trellis and mystery plant

I finally noticed new growth on my grape plant! I bought this a month ago at Walmart... the leaves yellowed... some started to rot... I thought for sure she was a goner, but nope! She’s back
Before I transplanted the grape plant into this pot, I had thrown a rotten red pepper in the soil.. hoping maybe a seed would grow. 2 plants like this came up about 2 weeks ago... so I transplanted them into their own pots.. could anyone verify if this is a pepper plant seedling?
After noticing the new growth I decided to build a trellis for it to soon grow vertically! I had these poles in my shed, stuck them in the ground, and attached the two with some gardening wire. 2 days later I had a fire ant mound built around my pot... so I guess I’ll have to address that soon... little buggers!