Should I be worried?

Daisy
I just found out I was pregnant on Friday the 29th. I'm not quite sure how far along I am. I have two apps and one says I'm 3 weeks and the other says 5 weeks. Anyway, I keep getting worried that I'm going to lose the baby, I've haven't experienced any morning sickness and I hope I don't but I've read that women who don't are most likely to miscarry or it means that somethings wrong. I'm really nervous and scared especially because i woke up feeling perfectly fine this morning...also is my lower stomach supposed to feel different? My mom always said that she knew she was pregnant when her lower stomach felt slightly hard, and mine doesn't feel like that. Should I be worried? Do all women go through this fear of miscarriage or am I just being a worry wart?