Can an indent show up on inverted test?

Kaylen

Hey guys I’m 8dp5dt, my only embryo was in early blastocyst stage so I wasn’t very hopeful to be honest. I took a test today and saw this. Could it be just the indent? Thank you for any input. PIO is actually making me feel insane and very down so almost want to stop ASAP if I’m not pregnant. When should a positive show up?