Cramping since 5dpo, 12dpo now

So 5-6dpo i was having sudden intense cramps that took my breath away, 7-8dpo i hardly had any, 9-12dpo (today) ive had dull achy cramps, that fade in then fade out. As of 11dpo, preg tests are still negative, af is due this saturday. Ive never cramped for literally a week before af, i usually cramp for a day or two before af. This is strange, is it an early pregnancy sign? Has anyone else experienced this and got a bfp?