Help what can this be????

Have a baby 3 months ago 20 days after we have sex with my husband and I took the plan B the day after just in case, 2 month ago I when to get my IUD in I told the nurse about it and I got a pregnant test done but was nothing, I be bleeding for almost 2 months just in the liner not a heavy bleeding, but tonight have this coming out 😕I’m confuse I don’t feel any pain or heavy bleeding but what can this be i also took this 2 test just now.