My period been really light this month. Almost not worth wearing a pad or tampon this whole time. I'm kinda confused because the last time

My period been really light this month. Almost not worth wearing a pad or tampon this whole time. I'm kinda confused because the last time I had bleeding close to this I was pregnant, but even that was heavier than this. I'm on birth control IUD, I've had it a little over a year and this is the only time I had spotting like this since I had it. Also back in February I skipped a period for 2 months which I've never done before either and even back then I had my IUD over 6 months. Idk if I should make a doctors appointment or not now.