Can I hurt the baby from being upset?!

Devan
I got really upset today like crying a lot and kind of angry. I tried my best to calm down as soon as possible but I am afraid I already damaged my little nugget. My stomach has kind of been in pain/cramping off and on. 
Tomorrow we have a US to see the heartbeat. I am 7 weeks. This is my 3rd pregnancy my other 2 ended in miscarriage. The first one I believe from all the stress I was going through. 
Am I crazy for thinking the stress and being upset will harm my baby?! Hope you ladies can provide some comfort.