11 dpo w/ 12 day luteal phase

KK

My luteal phase is nearly always 12 days (although this is my 1st full cycle since having my IUD out so maybe it’s changed). I’m 11 dpo (tracked with LH and BBT) now, and still getting all negative tests. I have sore boobs, which has nearly always been a sign of pregnancy for me (been pregnant 3 times, miscarried twice and the 3rd was a live birth). We had well timed intercourse. Is it still possible to get a positive test? Does the length of the luteal phase effect implantation or when you’re able to test?