Could this be IB? (a tiny bit tmi)

Mi • Mother of two babies in Heaven 👼 and an August 2019 toddler 😍❤️😍🙈
I got pregnant a couple of months ago and m/c shortly after. Back then I had IB two days before my BFP
Two days ago I experienced some cramping and from my calculations I presumed it could be from implantation. I told myself if I was right, I'd probably see some bleeding in a couple of days. 
Today I experienced some light dark brown spotting (I'm 10 DPO and AF is due in two days and I've never spotted before af before) - it seems to me like IB except for one thing: it came with some stringy clots and one rather large dark red clot. Could this still be it or am I out?