normal to feel extra tired at CD12?

I’m currently on CD12 & I've been extra tired these past few days. I've read that during ovulation you should be feeling energetic, but IMO I’m more tired recently than I was during my period. I also know ovulation more than likely hasn't occurred yet (I don't use OPKS) so I’m just asking is it normal at this stage? also its not because I havent gotten enough sleep. the past few nights I've gotten 10-12 hrs of sleep. could have slept longer if I allowed myself to.