which came out negative, i had another at 7 weeks also negative and i had one done today which is 11 weeks and is 3 days short of reaching the 12 week mark. how accurate do the past results are and does an 11 week test 3 days short of 12 weeks be as conclusive as the one at 12 weeks? and how can assure be that is going to be negative being negative in the last 2 test? i really appreciate any response thanks!