So I'm getting a new packet of pills on Monday but I'm supposed to start taking them again on Sunday or saturday night. Does this matter since I'm not sexually active?

Also my period (withdrawal bleed) is due today and they usually come before 10 or 11 and its 12 now and I'm starting to worry. I'm not worried about pregnancy because its been 7 almost 8 months since I've been in sexual contact with anyone and I've been having withdrawal bleeds since then so it's fine. I'm just stressing as to why it's not coming. Any ideas why? People keep on telling me its stress but I'm not too stressed, well for me anyway