Brown discharge 2 days before ovulation

Sheteah

So i had unprotected sex on the 6th i took a plan b pill a day after. And I received heavy blood flow with clots on the 14th-18th and now it’s my predicted fertile week and my predicted ovulation day is on the 27th what could this mean. Could i be pregnant or could it just be old blood? I also have cramps as well but not bad cramps like period cramps. Someone help