Ate, ang timeline mo is confusing kasi parang may two cycles happening dito, the spotting on Feb 25 and then the discharge patterns starting March 6 parang bagong cycle na, but honestly, the sore breasts, cramping, at yellow discharge combo kailangan talaga i-check ng doctor para makita kung ano talaga ang nangyayari, dahil PT mo was negative but symptoms mo nandito pa rin. One of my mum friends had similar thing and kailangan ng ultrasound para ma-confirm kung pregnant talaga siya or if may iba pang reason yung cramping at spotting. I know waiting is nerve-wracking, pero better safe na mag-consult, baka OB visit mo can give you clarity talaga.