Can blood test be false

Ovulation day was 27th of July So Me and my husband tried on 26th since he was starting his shift on 27th

Currently 10days late yet all My HCG been coming in Negative so decided to try a blood test and this is what came on 4days ago

so decided to try Easy mom and I still can’t see a line.

Please have anyone gone through this or has anyone got pregnant with a negative result

Please reply thanks