helping for a friend

she and her partner had unprotected sex which she didn't know if she was on her fertile days or ovulation day. they had two encounters which was 2 days apart from each other. the second one, still unprotected. she did the yuzpe method but same as my situation last time, she had vomited again and again during the second dose until i told her to just stop and not take anymore. a few days later, maybe 6/7 days, she had a bleeding. we don't know if its withdrawal or implantation but she described it as light but it had clots on the first day. it only lasted for two days and she's now worried if she'll be pregnant or not. should she take a test 14 days after her encounter?