i found out i was pregnant more than 1 week after i finished my pack of pill

I missed my period last february 24.. after more than a week and still i havent had my monthly period i do pt(4times) it was positve.. btw my last monthly period was on january 15, 2020. And on jan 25 nag pt dn po ako kc nga po nag contact kamk ng fiancee ko na d pa ako uminom ng pills pero negative naman.. uminom po ako ulit ng pills nung jan 26. My question is: 1. Safe lng ba baby ko kht nag take ako ng pills? 2. Kailan ang possible kaya na nabuntis ako