Only 3 DPO!!! Is this normal?

K
I'm only 3 DPO and I'm feeling kinda like full or pressure in my lower belly similar to the other times I've been pregnant. I'm also SUPER tired early in the day and haven't really did much and it was like this yesterday as well and I feel like it's too soon for these type of symptoms. I've also been experiencing painful boobies. 
I took a test and it was BFN but I was expecting that being that it's wayyyyy too early. 
Anyone been through something similar and if so what was your outcome?

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