so confused..😭

Georgia • 21 years old. Alison 17/01/16💖 Diesel🐶💙 16/06/17👼🏻💜 26/10/17👼🏻💜 30/01/18👼🏻💜 Henry 16/11/18💙 15/11/20 👼🏻👼🏻💜
We had a miscarriage with our second baby in October 2016 and we have been trying for another since.. I was just over 2 weeks late and had 3 positive pregnancy tests (taken on different days). I have a doctors appointment booked for Monday just to confirm. Now I've gone to the toilet and I'm bleeding. It's pink and light. 
I'm just so confused.. SO is being extremely supportive! We have a beautdaughter who is 13 months and she is our complete world. Since loosing our baby in October we have both been crushed. I was 5 weeks when we lost it in October so I know I wasn't very far along but it still killed us. Now I'm supposed to be 5 weeks + 3 days. 
I just don't understand. We found out when we lost the baby that I have PCOS which caused the miscarriage. I honestly don't know what to do anymore. I never get a positive test, let alone 3! 
Does anyone have any advice or has anyone gone through a similar situation? X