Am I or aren’t I pregnant?

Hey, just wondering if this has happened to anyone else as I’m starting to worry. Okay so my period is now 22 days late, I have been experiencing all the pregnancy symptoms but every test I have taken says negative and there is no sign that my period is coming, last night I was having really strong twinges in my lower abdomen I’ve never ever experienced this before. I understand that some women’s hcg levels are just sometimes low and I get that sometimes you can just miss a period but I had a miscarriage about a year and a half ago very early on in my pregnancy and I am wondering if I could be pregnant now and if that could have any effect on my low hcg levels. It’s driving me insane not knowing and I don’t know what I can do about it, I’ve called my doctor but can’t get an appointment for three weeks for blood tests. Do I go to the hospital and explain what’s happening? Can anybody help me:(