Can you start birth control pills on a Thursday?

Yes, you can. If we were sitting together, I could show you how to change your pill pack to make that work. Often, the directions for doing so are found in the package insert, or there may be stickers inside the pack to change the label for the first pill from "Sunday" to "Thursday." The easiest thing is to talk with your pharmacist or health care provider for advice specific to the brand of pill you're using.