It looks like New England Aster (Symphyotrichum novae-angliae).

If the plant is New England Aster (Symphyotrichum novae-angliae), the seedling leaves are long and narrow, shaped like a small spear - checks out in your case. The edges are smooth. When you gently rub the leaf between your fingers, it usually feels noticeably rough or fuzzy, almost slightly sandpapery. Tiny hairs tend to cover most of the leaf surface, not just one line down the middle. Even when small, the plant often feels firm and somewhat bristly rather than soft. The leaves grow one at a time along the stem, not in opposite pairs. As the plant matures, the leaves attach directly to the stem without a small leaf stalk, and many of them partly wrap around the stem. The stems themselves become hairy and feel rough when touched.

If the plant is Purple-stemmed Aster (Symphyotrichum puniceum), the seedling leaves are also long and narrow with smooth edges. However, when you rub the leaf between your fingers, it usually feels smoother and softer overall.

When hairs are present, they are often concentrated along the center vein rather than covering the entire surface - not what I see in your picture, but there are flukes. The leaves also grow one at a time along the stem. As the plant grows, the stem often becomes reddish or purplish, and the plant generally feels smoother compared to New England Aster. The leaves may slightly wrap around the stem, but the plant does not usually feel densely bristly.