Based on what you write, your timing was too late for a hefsek taharah to count as taking place on Thursday. If there are additional factors that might be relevant (e.g., some check or internal wiping performed earlier in the day or shalom bayit or fertility issues), please get back to us.

If the bedikah was not a hefsek taharah, but a regular bedikah of the clean days, it should not lead to any delay in immersion, unless it was the first or last day and no bedikah was performed that morning.

Please get back to us with any follow up questions.