I'm 5 weeks 5 days and I'm worried.

witchy 🌙
I have a dr app tomorrow to check the heartbeat and I am terrified. We tried for 2 years and this is my first pregnancy. I don't have many symptoms other than peeing a lot and very light cramps on and off that feel like light menstrual cramps. I fear that it means something will go wrong. 
My cheap pregnancy tests are IMMEDIATELY very, very dark and my digitals don't take long to show up positive but does that mean anything? 
Did anyone else experience this??