Late period? Pregnant ?

I really dont know how leukorrhea works as there are different forms of it. What I know it can be sign of period or pregnancy , which are in two extreme forms. Sometimes I have leukorrhea sometimes don’t. I don’t know why.

I explain my situation:

I suppose to have period one week ago. But maybe I know it’s due to stress over the past weeks so it’s late.

And I don’t know what happened to my boyfriend, he finished inside just now. We usually use withdrawal. What I discovered (after finish )is that I saw thick whitish leukorrhea on his dick.

Something like this

Sorry for the close shot, because I can’t find any similar to my exact outlook.

Can someone please explain what happened? Or what can I do ?