Probably Acalypha virginica, Virginia threeseed mercury. Pretty common residential weed.

It looks like wild carrots if it doesn’t grow upright and tall. Otherwise, it’s poison hemlock if it grows 2-4 feet tall and the stem and top of the root area are stripped or spotted with purple.

The lemon basil I have grown does have a distinct lemony smell, though it also has the smell and taste of basil mixed with it. It is a wonderful herb to use with fish, chicken, or vegetables. I have not made lemon basil tea, but am aware that basil tea has numerous health benefits. Have you considered adding some honey to it? You should be able to identify your plant by its leaf shape. Lemon balm has a rounded leaf with a scalloped edge. Lemon basil has a leaf that comes to a point and has a smooth edge, much like regular basil, but a bit narrower. I do not believe you have lemon balm, as I have never found a basil aroma or flavor in that herb.

My oregano was started from seeds the beginning of April and now have an inch or two stems of tiny green leaves, similar to thyme. The thyme leaves are on 3 inch stems though, and were started the same time. I also have rosemary started from seed and these too have a few small leaves. Just planted all of these, along with basil, shallots, asparagus, and tarragon, in my garden. There are a few varieties of oregano, with smaller round leaves, as well as larger oval pointed shaped leaves like the photo above.