Hello, I Use Lo Loestrin FE As Birth Control And

Hello, I use Lo Loestrin FE as birth control and rarely menstruate because of it. I was three pills into the new pack after the period where I should have menstruated and I had sexual intercourse. This triggered bleeding for the rest of the evening and was done the next day. Later on that day, I noticed large, yellowish-white pieces of tissue that looked like raw chicken skin along with yellowish discharge coming out of my vagina. This is the first time I have been sexually active in six months, do you have any idea what condition this is?