Ugh! Wth?!? I am 10 days pp... I basically have only been spotting (like maybe a quarter size spot…

Ugh! Wth?!? I am 10 days pp... I basically have only been spotting (like maybe a quarter size spot on a pad) since 4d pp... the past 2 days nothing on my pad... then after this last feed... I was walking to the bathroom and felt this weird sensation... so I ran, sat down and this large clot fell out... I could not tell in the water how big it was because the water was so red... now I'm having sharp stinging pains in my uterus... I don't remember anything like this after my first... anyone else stop bleeding super fast, then have it start up again? I'm feeling really crampy... it just feels unfamiliar... if that makes any sense! Any thoughts you have are appreciated!