How early can you have symptoms?

Hey ladies! I’m 33. Hubby had testicular cancer 2 1/2 years ago. we’ve been trying ever since, even went through fertility, but managed to get pregnant naturally in december. Unfortunately it ended in miscarriage. This month we feel good about it! Trying to relax and have fun. I’m 9dpo. Can i really have super bad indigestion and sour stomach this early? Has anyone else had pregnancy symptoms this early. I literally feel like I’m losing my mind and am making myself think I’m pregnant. 🤦🏻‍♀️