Irregular period and blood clots

So my period is always irregular but when it started this month it was very light then day 2 maybe 3 I started noticing huge blood clots at the bottom of the toilet but my tampons and pads didn’t really have a lot of blood on them I’m going on day 8 of this and I’m freaking out. I’ve tried everything to stop my period and I don’t think it’s going to stop soon , I’m scheduling an appointment but has anyone experienced this. I took a plan b about a month ago I’m thinking it might have something to do with that