Anyone implant late?

Sophie

I think I implanted on 11dpo. Had cramps all afternoon & early evening & one big pokey pain then too. Felt a teeny bit nauseous at 12dpo and boobs have remained sore & full since about 9dpo. I'm currently 14dpo and out of FRER tests (I've had three BFN on 9dpo, 10dpo & 12dpo). If I implanted on 11, should I wait til 15/16dpo to test again? AF was due yesterday, my CP is so high can barely reach it. CM is sticky/creamy but not masses. Just normal amount. Any help would be great!