Advice please

I'm 5 days late and have taken 5 tests which all have came back positive however I just have a feeling that until I get a scan or the okay from my doctor I don't really believe them, is that normal?

Also I would be around 4/5 weeks and some of the feelings I'm experiencing is like my period will come at anytime then it goes away so it's not constant but has anyone else felt this around this time?