If I accidentally placed something heavy on my abdomen is that going to hurt my baby?

I'm 8 weeks pregnant. This morning I was looking for my eyeglasses in my bag while sitting in front of my desk. My bag weighs roughly 10-15 kilos. I placed my bag on my desk but as I was zipping it close, it slid on my belly and the weight made me feel a bit uncomfortable. As you can imagine, I am very worried right now. What could have happened to my baby? I am such a worrier I know. But, I'm sometimes very careless that I'm afraid every movement I make is going to hurt my baby. Help, please. Should I have an ultrasound?