Late late late late

Okay guys I need your help I'm going to a festival this weekend and I'm due tomorrow but I haven't had any pms symptoms yet which makes me think I could be late (I always get pms symptoms) anyway I really hope I come on either before I go or after I come back but knowing my luck I'll start my period while I'm there🙄 I don't really care about the perioding part I just get agonising cramps and ibuprofen doesn't work anymore - is there anything I can do to either bring it on/delay it or just numb the pain cause it's too late to get a doctors appointment or anything now. Any help I would love thanks!

Although I do have some codeine left over from back pain a couple of years ago - could this suffice?