6weeks on the pill... And have pregnant symptoms

Joelene
6 weeks on 10mg Loestrin and previously on depo. I'm not usually a sick person nor do I vomit easily. 
Yesterday I threw up and have been extremely fatigued the last few days. 
I took a test this morning and it was negative. 
I'm confused... Anyone else experience this? Should I go in and get a blood test? Or wait it out..?

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