Hello and thank you for posting,

I am not aware that these two drugs specifically affect your monthly cycle. But there can be many reasons for a week late period.

I've posted here some information on these treatments in case useful and this is the NHS page on ovarian cysts.

Take care, and if you remain concerned do talk to someone from your hospital team.

If you want to talk things through with one of the nurses on our helpline the number to call is Freephone 0808 800 4040. The lines are open from 9 am till 5 pm, Monday to Friday.

Sarah.