TMI - pic of implantation bleeding?

So my fertile days started around June24th (day 12 of my cycle) and me and my DH BD'ed for 5 straight days. I'm not sure which day exactly I ovulated as I wasn't very consistently checking my temps or urine but since my temp has been elevated I assumed I did. Today after getting back from the beach I found this in my bathing suit I am wondering if it could be implantation bleeding or a bad sign since I was in the sun for two forty minute sessions? It was about 83 degrees but windy and I went into the cold jersey water in between...​ Thoughts?