Hcg level

I had my blood drawn Thursday and my hcg levels were 399. According to this app I was 4 weeks and 4 days but from my lmp I was 5 weeks. They told me everything is looking normal including my progesterone level. I have to go back Monday for another draw of blood to make sure my levels are increasing. I'm so excited this will be baby #1 for me. My husband and I still haven't told any yet.