Suggest Possible Birth Control Measures After Unsafe Sex.

I am 55 and had unprotected sex with a new partner the night before last. I get my periods almost monthly but they are starting to change a little. I had irregular periods for years and diagnosed with a micro Prolactinoma and treated with Dostinex until a year+ ago. my levels are normal. I wondering if I need to take the morning after pill. Time is running out.