EWCM or leftover sperm?

Sarah
Anyone else having trouble knowing what is what down there? Did the deed last night, have a bit of ewcm (u think) on toilet paper today & it's supposed to be my most fertile day. Buuuttt.... What if it's just semen coming out? So confused. And my opk tests aren't working, think they are out of date. The test line is sooo faint so I think they aren't working.