hi

in the month of September I and my wife had unprotected sex but we used emergency contraceptive pill and her periods came 5 days earlier on the 18th October.
This time, my wife and I had unprotected sex on her 10th day on 27th October, however I didn't come inside her.also she washed herself immediately after the sex. today is 19th November, her periods have not started. Can she be pregnant ? should we go for pregnancy test or should we wait for one or two days ?