Getting hit in the stomach?

Hi ladies.. So last night I was trying to put a heavy box in my car, and when I was opening the door, it hit the box and it came back and hit me in the pelvic/lower abdomen area... I’m 4w2d today and I’m worried that I somehow harmed the baby or will cause a miscarriage...:( I looked it up online and it said your uterus is well protected in the first trimester so I shouldn’t be worried but I need some reassurance... Do you think the baby will be okay?