Checking you CM

Faye • TTC after an ectopic pregnancy in 2013. Still no luck :(

I may sound a bit silly here, but I am in my ovulation windows (according to glow) so we are BD every day where possible. I have been trying to check my CM, but surely when trying for a baby, your SO does what he does up your lady parts and leaves them behind. So when checking your CM how will you know its you or your partner on your finger?? Trying to not sound gross but cant edge around this one I'm afraid 😳