FRER vs FRRR

Does anyone know the sensitivity of First Response Rapid Result? I bought the multipack today not realizing that the FRER and the FRRR were different. It says not to use the FRRR until the day of your missed period and I used it at 11dpo. I did get a BFP, but it’s no darker than my BFP from yesterday’s FRER. I started googling and learned that FRRR is quite a bit less sensitive than FRER, but I’ve seen people say anything from 50-100 miU/ml. This information is nowhere to be found on the first response website. Does anyone happen to know?