After so many tests....nervous

I've taken so many so early and of course got a negative but just got frustrated since I knew I had time still. Now today I was suppose to get my period and didn't but I'm still scared to test and waste more money on tests. I'm having cramping and I would be due the 19th which I haven't seen anyone due then yet so I'm thinking it still might be to early to test at home. What do u guys think ?