Thoughts please

So I’ve been taking birth control for almost a year now and I’m pretty good at taking them daily around the same time. August and September I skipped the placebo pills and started my period regular in October. I skipped my period again at the end of December because of my sisters wedding. And again for January because I had my dress fitting for my own wedding in March.

My fiancé and have never used anything but the pill as a contraceptive. But I was lightly bleeding/ spotting from Jan. 22-Feb 4 with cramping and severe back aches. Last night and this morning I felt very nauseous and my lower back still hurts. Although I’ve stopped spotting since last night I still have minor cramps as well. He came inside me a couple of days before I started spotting and then again last night.

I’m not sure if I should take a pregnancy test or if it’s just breakthrough bleeding from skipping. Any thoughts or opinions would greatly be appreciated.