Late period

All my life my period was never really late max 1-2 days (had it since 10 and now I’m 26). But this time I’m already six days late. Kinda worried what might be the problem. I know that I’m not pregnant since I have LDR and just met my partner after six long months. I have severe cramps usually so I started to take a vaginal pH balancer since one of my doctor said it will help since I don’t have hormonal imbalance. It wasn’t helping like crazy but made things a bit better. So before I flew to my partner I drank lemon juice before flying since I didn’t wanted to have my period on the plane and took my Beliema ph balancer. I thought I was able to push my period a day or two behind but not a week. I did not drink an excessive amount of lemon juice either. So I wonder why is it still not 🩸🩸🩸🩸🩸