Late + BFNs

Hi all,

This is my first time posting, so I hope I'm on the right board!

Question: My last period began on may 4. My average cycle is 36 days... I am late a few days (AF should have started on Friday) but all my tests have been negative. Is it possible that implantation occurred later on, and I am still in the two week waiting period?

Background

My DH and I have been TTC for 10 months. My doctor has asked us to try for a full year before any next steps. Which is very frustrating as I have always suffered from hormonal difficulties (cysts, excessive hair growth, painful cramps and a long cycle. AF lasts on average 10 days 😑). All that to say I hoped it would be as easy for me as it has been for all of my friends and my sister's. But in the back of my head I knew it wouldn't. I am 30 and i know that every year counts now, and to be honest I'm incredibly frustrated and depressed. What I hoped would be a happy hopeful time in our lives is now overwhelmed with fear, grief and isolation. My SIL just gave birth to a beautiful boy. And as happy as I am for her and her family, and as much as I love him (number eight of my love munchkins (nieces​ and nephews)) it hurts to literally see the baby I could not have. I have been trying for so long that I have literally been their for the announcement (on their first try), watched her grow during pregnancy and now have a new baby in our family. I can't help but think I could have also had a little one by now... Anyways... Sorry my short question turned into a long rambling story. Baby dust to all!