Am I overthinking

My husband and I have been TTC for 4 months now. I'm 7dpo and I'm not sure if I'm pregnant or if it's just AF coming.

The past few days I've had extra discharge and my appetite has been a little off. Sometimes I'm starving sometimes I eat a little and am full and then I smell quesadillas and am hungry again. I havent been sleeping well either. I'm tired but wake up in the middle of the night wide awake. Last night I got bad cramps and today I have a mix of bad cramps and lower back pain that come in waves almost. My boobs are really really sore too.

Could this be implantation or am I just over analyzing things during my TWW? I know overthinking can cause AF to come later so I just wanted to know if anyone had any thoughts.