Baby got hit in the head??

Hi everyone. Not sure if this may seem silly but I’m stressing it! My SO tossed a diaper toward the garbage can, but he missed and it hit something else and came back my way hitting my 4 month old in her forehead area. I think it scared her more than anything, she did cry for a couple minutes. Could this have done any serious damage? There is no bump but she’s never been hurt before and I don’t want to take any chances if she could be injured more than what it appears!