Discharge... Pregnant??

I know there's always discharge, but it's been two days that I have an excessive amount of it. It's white and gooey, it's gross.I am sexually active, no birth control. We're not trying to prevent it but we're not trying to conceive either. My period is irregular so idk when my next one is due, also, I wouldn't know when I should test or if I should. Suggestions?