22dpo help

Hello, I’m currently 22 dpo 8 days late for my period. I’m totally lost and baffled by why my period is this late. I’ve taken pregnancy tests 13-15 dpo and were totally negative. I took first response at 19 dpo, and saw what I thought was a faint line but so faint that you couldn’t guarentee it was positive. the next day I took a digital I thought it would clear things up and both said “Not Pregnant”. Then at 21 dpo I took a dollar store test and after waiting a minute and not seeing a second viable line I threw it out. So now I’m 8 days late, 22 dpo, negative tests and don’t know where I stand. I have normal 28-32ish cycles every month. Why this month it is so late I don’t get because the home pregnancy tests have said negative. I don’t have irregular cycles and last time I was late I was pregnant... but I had very dark lines around this time (day 40ish) if I can remember. I’m tempted to give another first response test a go. I have symptoms I feel nauseaus fatigued lost appetite sick feeling. At what point do I go to a doctor and get a blood test? Any advice thoughts or opinions

Thank you.