Any guesses at how far along I might be?

Brooklyn

I honestly have no idea as I was on birth control and ended up pregnant. I got a bfn on September 2nd with a cheapie test and got a bfp on September 4th with frer. I had spotting on August 27-28 that could have been ovulation spotting or implantation spotting or just super weird random spotting. First hcg test September 11 with 549 miu/mL and on September 14 it was 1207 miu/mL. I just want to know how far along I might be or a possible due date. The not knowing is killing me!!!