Ay mama, honestly kahit mababa ang chance during your period kaya may risk pa rin especially if your cycle is shorter or irregular, kaya better to do a pregnancy test after 2 weeks if delayed ang next period mo para sure na, or mag-consult na lang with your OB para ma-guide properly. A few of us mums dito nag-panic din before, so alam ko ang worry mo, pero ang safest talaga is to get it checked with a doctor para mapawi ang peace of mind mo!