Ay sis, sobrang importante talaga na magpa-check up ka na kasi ang irregularities with PCOS can be tricky, parang with my friend who also has PCOS, ang cycles niya fluctuate ng sobra, pero when she got pregnant hindi agad niya na-detect kaya better safe na mag-urine test or blood test na para sure. Since you had spotting after the long delay and it's different from your usual flow, it could be pregnancy, PCOS acting up, or hormonal imbalance, pero doc lang talaga ang makakapag-confirm ng tama para sa peace of mind mo, especially with your condition. Don't stress muna while you wait for your appointment, but do schedule it asap ha!