Based on calendar method po, 5 days before and 5 days after menstruation is considered safe po. So most likely you won't get pregnant. The fact that you had your period the following day only tells you that you're not pregnant po.
Hindi. Niregla ka na diba? Paano ka pa mabubuntis.
kapag nagka regla ka after definitely hindi na.
Hindi po kayo mabubuntis.
Malaki chance na hindi.