No blood on pad

Hello I’ve searched and searched for an answer on here but i couldn’t find anything so I’m hoping someone reading might know the answer.

I’m having all the symptoms for my period. When I use the bathroom and wipe there’s clearly period blood on the napkin, bright red with a tiny clot or something. My pad however is completely clean. Is there a reason for this?? Today is day 1 of bleeding FYI.