Girls, hello everyone. Sorry for writing so late. I have such a situat…

Girls, hello everyone. Sorry for writing so late. I have such a situation: the beginning of last period was June 17th, 2023. Now according to the calendar there is a delay of 5 days. High-sensitive tests are negative, today I had an ultrasound, pregnancy wasn't seen (or the term is small or it doesn't exist). In two days I will go to get my HCG checked. I am very worried about pregnancy, if it exists, it's desired, we really want a child. Who had such that tests don't show up, and on ultrasound you can't see?