on cd 51 !!! longest ever was 31 !!! advice please

Rachael
Hey guys I'm on cd 51 !!!!!! Iv never ever been this long the longest cycle iv had to record is 32 iv done a preg test yesterday and it Caim up neg I don't want to think or believe I could be pregnant as me and partner has been trying for 2 years now and no joy 😒 when do you think it's right I should go see my doctor ?? And has anyone eles suffered this before I previously been tested for thyroids and they Caim back clear I'm now worried it could be something eles 🙈 thank you and ✨✨ spreading baby dust ✨✨👶🏼