QUESTION LADIES THAT HAVE TAKEN PLAN B

So my best friend came into work on Friday and started spilling tea to me about how she spent all night Thursday in a hotel with one of her best guy friends and they had sex about 8 times that night. Didn’t use any protection and she told me that he said he pulled out every time and she wasn’t worried about it. Me and another friend convinced her to go get plan b anyway just in case. So we all 3 went to CVS together and got her the pill and she took it around 8:30 on Friday night. She didn’t feel any symptoms that night (she stayed the night at my house) but the next day (Saturday) after I took her home, she started feeling some slight cramps. But now, almost a full 48 hours later she is still feeling cramps. Is that normal? Should she go to the doctor or just wait it out?