Im 36 days late. Four negative test. Time for the doctors?

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I took another pregnancy test & it came out negative.

Ever since the first day I missed my period my boyfriend & I have gotten excited about the idea of having a bundle of joy. We have unprotected sex about once or twice every other day. If I’m not getting my period, can I still have a chance of getting pregnant.

Either way I have to go to the doctors.