You know what?
You didn't mention wether it was messing with you or not.
I assumed it was.
If it was then what I said before applies.
But there is the chance that it was just a curious spirit..or non corporal creature..maybe even a guide. Maybe your hormonal driven heightened awareness right now allowed you to be aware.?
Heck, it might have even just been a remote veiwer or skin walker checking in on you..another, very psychic person spying on you. (or maybe even..them..you know..litle bald, big headed persons)
If that's the case, depending on how you feel, you could either add energy or subtract energy to the situation.
draw it in more and ask questions or politely ask it to leave you be..as you're not into all that.
I see you did mention it felt evil..oh well..I'll leave this post here, anyway..in case it is of soem use to you or anybody else who might need it.
Maybe you need to sage your house? Or light up a cigar?
Do a cleasing prayer/ritual or soemthing liek that..just in case.
energy goes where and how it's directed..if bad mojo is trying to rise around you..I say nip it in the bud
“Whether you sniff it smoke it eat it or shove it up your ass the result is the same: addiction.”
― William S. Burroughs
(love&forgive yourself..and everyone else)