Hit head

I feel horrible. Yesterday at around 3pm my baby was playing in her play pen. She stood on top of a her toy car with wheels, fell back pretty hard onto her foam mat. She cried for a minute and then calmed down. Then at 7:00 pm we were laying in bed and she threw herself back, she hit the wall hard. She cried for about 2 minutes then calmed down. I feel so guilty and I’ve been over analyzing everything she does today. I will be taking her to the pediatrician on Monday. She seems normal but I just don’t have peace of mind. Is there anything that I should look out for in the meantime?