really need some hope right now and advice

So I'm 9 today late on my period !!! I'm so shocked never in my life I was ever this late it's so weird but I been ttc for 6 years and now I'm late but every test IS NEGATIVE!! Im so confused!! I just tested today also and negative please let me know what to do at this point my obgyn isn't going to take again until I start my period or get a positive test so advice please should I keep testing ? Everyday or test again today