So late... So Confused!!

I’m 15 days late..... I’ve been stressed and anxious for the past month. My period is (I guess) irregular, with cycles going anywhere from 19 days - 48 days! I’m stressed. I’ve been cramping off and on for about two weeks, I haven’t had sex in almost 10 months... I don’t think there’s any possible way I’m pregnant! But at the same time my anxiety keeps telling me to take a test even though I know it will say Neg....... idk what to do rn...... I have a OBGYN appointment a month from now but it’s really bothering me that I haven’t had my period yet.... I missed the entire month of June...... advice anyone? Please....