Not showing?

I'm 5 wks 4 days and not showing at all. I've had zero nausea and have obly had to pee and had mild cramps. That's normal right? I keep looking at other mom's with bellies already and it has me scared I'm doing something wrong. I wanna run to the doctor all the time to check on the baby but then that seems silly. My fiancee tells me to breath and stop stressing but it's hard. This is my first baby and I'm scared I'm no going to be a good mom or that I'm going to miscarry because I did something wrong