implantation bleed or AF?

So I'm spotting and I don't know if it's AF or possible Implation bleed. I'm 11dpo I think. I'm almost 6 months post pardum and still nursing my son 4-5x per day. I have had a couple periods since I have given birth but it has been 45 days since last AF. I was somewhat regular before this AF. The last two I had were 33 or 34 days apart and that was while nursing as well. The only reason I think I'm 11dpo is because I use the glow app and opk clear blue advanced test. I know you could get a +opk and still not ovulate right?  So my question is 11dpo too late for implantation bleed?  Last two pregnancies I had implantation cramping around 8-9 dpo this one nothing. I know each one and be different. I'm thinking is AF and I will have to wean completly to get BFP. Any insight would be appreciated.