Hi Shaz7172. Welcome to this great forum. No concern is ridiculous.
Your periods have not returned. This bleeding is purely in response to the HRT and the sudden stopping of the progesterone element. The oestrogen in the HRT has built up your womb lining and now that you have stopped taking it the withdrawal of the progesterone has caused it to shed. This keeps your womb lining healthy. You are not fertile again so no worries on that score. It hasn't kick- started your ovaries.
It can take up to three months to settle on any HRT. In what way did you feel awful and which type of HRT were you using?
Taz x