really concerned

Vivianna • Vivianna is the name. You can call me Vivian for short. Mother to a beautiful 8 year old girl!!! My husband and I have been together for 9 years and married for 8!!! My husband and I have been trying for 30 months now.
So I was supposed to have started my period on the 18th and now it's the 23rd and nothing but I took two tests on on the 17th and it said not pregnant then I took the last one the morning of the 22nd and that said not pregnant so I'm wondering if it's still too soon or where is my period at because I can't track my cycle without a period like really