I want to know if anyone has went through or is going through the same thing

Julia
This is my first time posting ... 
I'm going through something weird I just want to know if anyone else is or has ...
September 11th I was suppose to get my period but I didn't maybe a week later I spotted for two days but no period took three preg tests and all negative now October 14th still no period and I'm always on time ... I haven't taken another one yet ...
My boobs don't hurt, I'm tired a lot and thirsty all the time... back in July (ttc) I had a miscarriage august 11 I had my period .... could I be pregnant again or is my body probably still out of whack ??? Has this happened to anyone ?? Please help, thanks !