Light pink/ brown spotting/bleeding.

My last menstural period was on 02.06.2024. My average period cycle in past 6 to 7 months is 35 days. Last two cycles were around 30 days. Period usually lasts for 4 days. We hav been ttc and tried during ovulation window too.i missed my period and tried testing on 4th day after missing period and tested negative. From 12.07.2024  occassionally had brown discharge for 2 days. On 16.07.24 had brown spotting on wiping only during morning. On 17.06.24 having brown/light pink spotting in a higher frequency but not like usual periods. No clumps at all.For past 2 weeks i am always tired, body ache in thighs,lower back and occasionally in lower belly, occassional headaches and mood swings. What is the reason? What should i do? I had never been diagnosed with pcos, thyroid in the past( tests done in past). Is there a possibility of pregnancy?