Hello Kennedy and welcome to HCM
is a blood thinner and should be used very precautionally under the guideness of your doctor and keep in touch of your doctor regularly.
Now to get rid from your problem get your INR checked and if it is between 2-3 than nothing to worry about but if it is more than 3 than stop warfarin and check your INR dialy until it come between 2-3. Than Consult your doctor and revise your dose of Warfarin.
The patient on Warfarin have to check their INR after every 15 days and get adjusted the dose of warfarin according to that. The raised value of INR can result to the problem you are facing. Even it may cause bleeding in urine, gums and stool or even stoke.
So my advise to you is to check you INR regularly and keep in touch of your doctor.