Hopefully Implantation Bleeding

I should have O'd last week early in the week, bd just about every day. well yesterday pretty much all day, I had a weird feeling in my lower pelvic area kinda like a mixture of non AF cramps and I guess pressure. I had to pee before bed and when I wiped there was a little bit of pink tinted mucus, i mean so like you could barely see it, then with FMU I had a little bit the same but brown tinted very small. Hubs and I bd this morning and upon cleaning up saw a little brown on the wipe. Nothing since no blood tinges or cramps or pressure today. Could that have been Implantation bleeding? AF not due till the 15th. Thanks in Advance for your advice.