I finished a motaa and I have to complete my iddah. The thing is, I will have to take pills and they will stop my periods, I’ve already had one period, how will I count my iddah then? Will it be 45 days from the day the motaa ended or 45 days from the last time I had my periods?

If you had not seen your periods at all, you would have to wait for 45 days but since you've seen your periods once, if possible refrain from taking the pills till you see your second period because if you do start the pills, the time of your iddah will become difficult and long