If I got a + OPK on 9/1/16 when do I count dpo1 as?

RR • Together since 2009 | Married since 2014 | 3 M/C`s | MTHFR | Rainbow baby born 07/02/17💗 #2 Due 12/21/20!!
opk on 9/1/16 when do I count dpo1 as?" />
Thanks for voting! Got my VVVFL BFP on 9/11/16. Trying to figure out how many DPO that would be.  Dr is measuring me at 4weeks 3days but I think It's more like 3 weeks and some change. 

Vote below to see results!