I am aware that you have tons of these subjects here but non of the answers really helped me.. most of them said 'you might be pregnat' or something like that..
I believe it's a bit early to stress out if my period is 2-3 days late, but I am worried since I had unprotected sex 10 days ago.. the thing is, he was inside me only for minute or two (as a test, to know how does it feel like without protecting, he didn't finish inside, and I peed and took shower right after I came home (4h after that)), but since we are both aware of pre ejaculation, we started to panic.. I searched the internet since I don't have money to by pregnency test...
I checked my cervix, it's low and as a tip of a nose but when I read that that can't help much, I've searched statistics (it said that the chance to get pregnant is 2%, 50% of eggs that were in touch with seeman 'die', and that egg can live up to 2 days but seeman up to 7 days)..
About the discharge during sex, it was white and I've read discharge is like that after ovulation.. I've been checking discharge past few days and it was sticky and whiteish (by putting my fingers inside because there is not much of it on my undeawear)...
My diet is not good, I eat anything tasty looking and sleep but I'm not overweight.. is it posible that period can be late if I'm not actice enough?
My last period was on 19.06. An it lasted for 4 (as usual) days and last cycle lasted for 26 days.. I don't know when my ovulation was..

If I am not pregnant, than what else can cause late period?

Stress can cause a late period and the sticky white discharge could be sperm.