Just not sure!!

So I had my last period on the 14th-18th June.. Monday I took a clear blue digital test and yep positive 1-2weeks.. so I completed another Tuesday and again 1-2 weeks.. not really sure what to think as my period is due Friday.. and it's bothering me as to working out how far along I am.. have doc appointment tomorrow but I'm freaking out I'm super early along in pregnacy I'm feeling nauseaous, and lethargic more so now than I did when I was having my first baby!! Has anyone else had similar story?