It's Alive!! - HMM (explored)

I usually keep the pots with my plants outside during warm time of the year and bring them inside for winter. But this time a few weeks laters I saw those wild baby plants in one of the pots. I am not sure that kind of plant it is, probably clover (?), but it is tiny and alive. A few weeks ago when I took this picture this plant was less than half of an inch.

Update: It is not a clover, it is some type of oxalis.

Done