HELLPPP ?!!?!?

I HAVE NEVER HAD THIS COME OUT OF ME. I have been having my period for five years now. In the past i used birth control pills which allowed me to have a period every three months and never received any complications, but i decided just two months ago to try out the patch and i had forgotten to get a refill so i just started regulating two days ago like normal. Yesterday a chunky piece of, i think tissue came out and now this and i know that periods are when you lose your lining and everything but this has never ever happened to me before. I don't know anyone else that has complained about this happening to them. Please if someone could just give me some type of insight on what the hell is happening it'd be much appreciated.