Even if your INR was below 2 for a while, it shouldn't be a big deal -- it's when it's down for four days (or often a week or more) that the risk of stroke has been documented. I'm with the others -- take your daily dose (which you've already done) and continue dosing as usual. Even if you've somehow doubled your dose on one day, it shouldn't be a big deal.
I may be one of the people who gave you the idea that meters are inaccurate. I've been self-testing for more than five years. I started wtth ProTime and moved to ProTime3. From there, it was usually InRatio. I was testing with an InRatio when I had a TIA (which some alarmist doctors called a stroke). When I went into the hospital with symptoms, the InRatio said 2.6 -- the hospital lab said 1.7.
After this, I wanted to find the most accurate method, with the understanding that I'd rather have a meter that slightly understimates the lab results than one that is higher than the actual lab results, because I don't EVER want my INR to drop below 2.0 again.
I'm trusting the hospital lab, where I get tested monthly.
In my experience comparing meters to each other, and to the monthly lab tests, the Coag-Sense is usually .2 - .4 lower the lab, and the CoaguChek XS is usually .2-.5 above the lab. Occasionally one or the other will be even closer to the lab results than this. I no longer trust the InRatio, and it appears (for a while, at least, until they clear up some strip quality issues), to not be a significant rival to the other two meters.
The key here is 'reliability.' I'm using this as a statistical term -- a meter that has a consistent degree of variation from your lab's result should be fine for testing -- in the case of Coag-Sense, I can assume a .2-.4 difference, and the CoaguChek XS will have a similar difference. If they're ALWAYS different by roughly the same amount, such a meter should be perfectly acceptable (and reliable) -- to get the lab value, just add to or subtract from your meter's result.
I am a strong believer in, and proponent of, self-testing. I still think that weekly testing is the best frequency (although I've sometimes gone up to two weeks). In my case, and that of many others, we not only self-test, we also self-manage, while letting the medical professionals think that they're helping. (A monthly blood draw, for comparison with your meter's resultis) is also a good idea.
I really like the alarm idea! and I looked into home testing, some of my research from a year ago (some of it from this forum) held the general opinion that home testing wasn't accurate enough or reliable enough to trust yet.... has the general consensus on that change?
