Spotting or another period?

I started taking Tri-Sprintec on 1/14/19 which was when my LMP started. It ended 4 days later and I had no spotting in between. I was really emotional but had pretty much no other symptoms. Today I wake up and it looks like I got my period again. It is definitely too much to be light spotting, as I went through 4 tampons today like a heavy day of my regular period. I normally never spot and the one or two times I have one it’s very light. Is this just my body adjusting to birth control? Is this just bleeding as a result of that or another period? I’m confused. Thanks.