Implantion bleeding?

Megan

So today is my 6 day after ovulation and this morning I went to the bathroom when I woke up and there was some dark brown reddish blood when I wiped. I've also had some faint cramps, headaches and some pretty bad mood swings. Me and my husband had sex last night but he has never in the 6 years we've been together made me bleed. Is it implantion bleeding?