When to call the obgyn

It's been 45 days since the last day of my last period. I've never been this late(prior to starting BC) I feel bloated, emotional, back hurts, gassy, mild cramps on and off for the last few days. I've tested negative. Wondering when I should go to the doctor? I do feel like I have a uti too. :( I just know they can be rude when you're late and I don't know what else to do. I really need to know if I'm pregnant (job hazards).