how did you know that your pregnant?

Didn't know I'm pregnant unti I noticed yung sore boobs for 3 weeks pero di ako dinadatnan. Irreg ako so not having a period for a month is normal for me and I just had my period the month before. Pero pag masakit na boobs ko, usually sign na yun na magkakaron na ko. Pero nung 3 weeks na wala parin, I've decided na magpt then boom! Buntis pala. 😅