Could this possibly be implantation bleeding?

My husband and I are TTC and I ovulated on June 14th(BD'd on June 12,13,& 15 around the correct time). Next cycle is supposed to start on June 29th-30th. Well on the 23rd of this month, I had some light brown mucus like discharge. I only had it when I wiped. Then that afternoon I had a little more that was brown and pinkish mucus like discharge. Then it went away and I don't have anything now. Could that possibly be implantation bleeding?My cycles are always 27-28 days in length, so I know that stuff wasn't an early period. If it was implantation bleeding, when can I take a pregnancy test and get a possible + result?