What are the chances?!

So I have a longer cycle (29-32 days) and I tend to ovulate about day 17. Today is cycle day 27, 10 DPO and I started having some light bleeding. Husband and I use condoms because we are currently not trying as he’s getting deployed this month.  I know condoms are not 100% so I just wanted to prepare myself, what is the likelihood of this is implantation bleeding and not my period?  It’s just light spotting when I wipe.

nothing in a pad.