Pregnant or late..

So me and my SO are trying to have a baby and well I'm 4 days late. I really hope I'm pregnant but I don't want to test yet because I don't want to see a negative so I'm waiting to be at least a week late. We really want a baby. And I read online that having sex before you get your period can delay it. And I've been having sex for days daily lol.
Would you say I'm late cause of the sex? 
Or I could possibly be pregnant?

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