missed period!!

Just under two months ago (7 weeks) I started taking the contraceptive pill. I didn’t realise you were supposed to take a week off after three weeks to allow yourself to have your period so when I missed my period this month by around two weeks I started to worry but after taking a test and it being negative I started researching what it might be and turns out you can delay your period for around three weeks if you take your pills back to back so this Tuesday I didn’t take a pill and haven’t to allow myself to have a period but nothing has come yet so I’m wondering if anyone who’s how long it should roughly take for your period to come back after taking pills back to back! Thank you!