Could it be implantation?

So I’m 6 DPO. My period is 7 days away according to glow. My breasts are tender (started yesterday morning and became more sore throughout the day) but that’s not totally abnormal once I start to PMS. Today I noticed slightly brown spotting mixed with CM and I wiped and there were small traces of brown spotting but nothing more. I don’t have my typical PMS cramps that usually start after I ovulate which is weird since I do have Endo. I typically cramp from after ovulation until after my period. I have some acne also which usually doesn’t come until the day before AF. Could the spotting be implantation? I know it could also mean AF but not having any PMS cramps is really throwing me off. Any advice is welcome!!!!