Another Let Down

So my husband and i have been TTC for 9 months now and last month i had my period super early it normally shows its ugly face at 40 days but this month it showed up on CD 28 but it was different i only spotted the entire time. My period is normally 5-6 day long but this time it only lasted 4 days and i had super light pink spotting and brown discharge i thought could it be implantation bleeding. Well once again i was dissappoited because i got two BFN i swear ill never get pregnant. TTC with PCOS is impossible!