Please help!!

So I'm very scared I'm pregnant but I suspect it's my birth control.. it's only been my second month taking this new birth control and I've been feeling like throwing up, a lot of headaches, a little bit of back pain, tired, and I've been spotting for 2 or 3 days. But my period is coming in 4-6 days... I'm confused and worried, is this my period/birth control or am I pregnant ??