Pregnancy test question

So first off, i am on birth control pill and i usually have my boyfriend pull out, even though I take mine every day at the same time, never miss a pill. 
But the last time I had sex was jan. 25th and my boyfriend forgot to pull out. I knew im fine but I was being paranoid so I took a pregnancy test, and it was negative, on Friday, Jan 30th and my expected period is Feb. 3rd. I think it's pretty accurate since the kind I used said I can take it up to 4 days before my expected period. 
Opinions? 

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