norethindrone

hi! just started this new bc last month, started second pack yesterday when do I expect a period? has anyone had no periods with it? how are you supp to know if not pregnant?!? 😂 I take same time everyday (try to as best as possible) just changed it a little earlier which will help me regulate it better with time, just still at a loss if I should get a period or not? 🤦🏻‍♀️🙄 dr doesn’t seem to have any answers other than it could be all over the place.