Advice please!

Hi ladies, I am looking for your thoughts and advice on my situation. According to the app I am 16DPO and two days late for my expected period. I took a pregnancy test this morning and I am pretty sure I didn’t see a second line.

My period usually is very very accurate and I start on the expected day. I have noticed very subtle possible pregnancy symptoms- very mild cramping occasionally in my lower abdomen, tender breasts sometimes, I have been feeling hungrier that usual.

In your experience, is there a remote possibility I could be pregnant as if I would have thought if I was pregnant I would have had atleast a faint positive by now? Should I wait 48 hours to test again or should I just book myself for bloods?

Thank you all very much xx