Frequent Spotting Between Periods... 😕

Emily
So for about a month and a half now, I've been experiencing spotting between my periods. It's become heavier and more frequent (It used to happen for two or three days between cycles; now, it happens for at LEAST a week.), so I'm beginning to wonder if something is wrong???
I am currently taking mini-pills. I've been on them for about 7 months and I take them VERY consistently. I've been late to take my pill maybe twice ever. I've been under a lot of stress lately, so perhaps that could be all that's going on? I hope it's something as simple as that... It's not painful. It's more annoying than anything, really.
Anyway. Do any of you know of any reason this could be happening to me? Is this something I should talk about with my gynecologist (sooner rather than later)?