I have a friend that started testing at the same time as you. She did not get a positive HPT till 8dp5dt. She was ready to get a gestational carrier, because this was her second DE cycle and she felt it was just her. She had a beta of 136 on Monday, which was 9dp5dt and will have her second beta today.
Hang in there and believe in your embryo. You are it's momma and it needs you to believe.