Is my friend Pregnant??

So my friend usually comes to me for a lot of advice and all her problems but this time idk if I can help. So here’s the story , my friend said she started her birth control about a month ago. She got her period on June 22nd and then took a plan B the day before her last day so it would end quicker . I guess it worked cause she had a dick appointment the next day. Anyways he didn’t pull out and now she thinks she’s not pregnant since she took the plan B before sex. I told her it’s called the morning after pill for a reason. So am I right or is she???