Is it + or -?

Hi. Me and my husband have been trying off and on for 3 years but only seriously got into trying as much as possible the past 3 months. We have been struggling since i do have PCOS along with irregular periods. My last period was april 27th - may 2nd. Since then i have 1 confirmed ovulation on june 28th which i too advantage of by doing the BD. I have not seen my period yet but it was due this month. Instead of my period i have gotten spotting that range from dark brown to pink in color. This has been happening since july 5th and its now july 11th. I think its implantation bleeding but im unsure. Has anyone else had this problem and it was due to something else? Or due to pregnancy? Also how long did yall wait to test?