Right after your cycle ended you won't be pregnant.
Some women experience what seems to be a cycle but it's just kind of heavy unexplained bleeding at the beginning of a pregnancy.
If you had a normal period that came on time, you aren't pregnant a couple days after it ended. It's likely you have a virus that's making you nauseated and dizzy.
No I was meaning right after my cycle ended.
Do you mean after you period ends? If so you likely haven't even ovulated yet. If you mean end of the full cycle and your expecting your period right now then for sure you could feel symptoms.