Cramping but no period

My period was due 2-4 days ago give or take. I have been experiencing crampiness in my uterus mainly, but also ovaries, since the day my period was due. I’m even currently experiencing some uncomfortableness in my uterus and lower back right now. I’ve also had sore nipples since about when it was supposed to start as well. I haven’t really noticed any discharge at all, could I be pregnant? Or should I keep waiting?

My period can be irregular or regular .

Since the beginning of this year, my cycles have been anywhere from 24 days to 34 days. But today marks 35, currently evening.. what do you guys think!? I feel like I should be getting my period because the cramps/back/ & uncomfortableness. But nothing yet! When should I test?