Freaking out!!!

OK so I've been cramping and having lower back pain for like a week and a half now. My period is now late by six days. I have an 8 month old already. In January I never got my period but never had cramps.last time I was this way I found out i was pregnant. So I'm in need so advice I guess. Should I wait it out and see if I get it next month or should I take the test. Or maybe someone just calm me down. Lol I could use all three.