2 negative test and a month with no period.

Shavon
Ok so i havent had my period since the 5th of February, took a test at home.... And it came back negative. So i went to the doctors amd I got another negative test. Should my next option be to get the blood work done? Ive had little minor symptoms for my period but after a week i was good. My boobs are a little bigger and tender but other than that i have no pregnancy symptoms. Has anyone else had this problem? TALK TO ME!!