3 days missed period

Sophie

So due to finding out I may have pcos me and my partner was still trying but not as much because I just felt like my hopes had been dropped. Back story even though I may have pcos my period has never been late the days may chance for example on average my period is ever 22/24 days sometimes it’s been more but last few months it’s stuck to that kind of cycle. I am now 3 days late so I thought I would test this morning however got a negative result do I wait till a week or could if just be nothing.