Pregnancy symptoms but negative test...

Kendra
I took a test (Jan 1st) it came out negative then I went to the doctor for a routine check up for my blood pressure and to get back on birth control so of course I had to do a urine pregnancy test  that also came out negative (Jan 7th) , I have one child so I know the symptoms and I'm having quite a few of them . If I were pregnant wouldn't it show up in urine by now? Everyday I'm Nauseous or puking , fatigued , feeling bloated , sensitivity to smells , & mood swings. I just took another test yesterday that came out negative. Not sure if I should should not worry or get blood work done. If I'm not pregnant what in the world is causing this!?