Hi just a quick question, my INR yesterday went down to 1.8 ,(2-3 range for mech st Jude) told to go from 6 mg to 7 mg daily dose, took 8 mg as a booster dose last night, did a self test this morning on coaguchek and INR has gone to 2.2, do others have it change that quick in 24 hours?? Thanks