I'm really frustrated with my body. Getting all PMS symptoms but still no af. Definitely not…

I'm really frustrated with my body. Getting all PMS symptoms but still no af. Definitely not pregnant. Over a week late. I don't know what is going on. I won't be able to see my OB/GYN until December. I wonder if I have a hormnal imbalance.. I mean my periods were regular before my first pregnancy but since the miscarriage they are all over the place. I just wish I knew why!