Your first signs of pregnancy?

Ki

I know it’s probably just in my head cause I’m only 4 DPO. BUT my boobs feel uncomfortable in a bra and out of a bra and almost slightly bigger. And I have the slightest little cramps. Like not as bad as period cramps at all but just a tiny bit of pain. Anyone else experienced this? I don’t want to over think it but since it’s too soon to test I’m just curious.