Well it will eventually flower but it is at a very early stage. When it has a few more leaves it will be easier to identify.
Do you remember what you sowed in the pot?

No i can't remember lol, one day I'll mark them as I sow them

can you remember which plants you planned to sow even if not pot by pot?

There are some that I don't label as I really know them but it is just one of those faff things I don't always do.

could be mirabilis 4 oclocks

Wait for the true leaves to come up. Maybe then you'll recognize it.

I'm thinking that it's a radish seedling.