Late Period, but on pill

I need help. 🙈 I am on the pill and my boyfriend and I have unprotected sex frequently. but he pulls out, and I am on top of taking my pills (yes, I know, pregnancy is still possible since we are unprotected) but last month, April, we had sex only once around the beginning-middle of the month. Like the 11th or so. My period tracker said I was supposed to start that following 23rd. Well it's now May 4th, and I still have not started my period but I am cramping like I do when I am on my period so I'm seriously confused and very worried. I would just run out and get a pregnancy test, but I'm not able to get one at the time being. So please, any one with any suggestions, please help!!