Hcg level

Destiny • Im a 33 year old mom to 2 beautiful kids 16 year old boy & 14 year old girl.....so excited to be expexting another lil blessing with the love of my life!
Ok so I've took like 6 test since Friday all positive getting darker as the days go. Yesterday I went and took blood test got results today and doc office told me that my hcg level is 2.8 that I'm barely pregnant like 4 weeks and that what this app came up with as well. Well today my periods due and so far just a little spotting here and there, praying everything is ok and baby sticks. Any advice out there? Anyone ever experience this and got a good out come? Please help ladies trying to stay positive