Oddly enough I've also been paranoid about blood clots for some time now! Like the last poster said, it is normal for your legs to be slightly different sizes. What you want to look out for is a significant size difference, unexplained bruising, redness, swelling, extreme difficulty walking, etc. Not everyone shows these symptoms but if you do you will want to get looked at. Also watch out for any chest pain, unexplained shortness of breath, coughing up blood, etc as this could signify a pulmonary embolism. My grandpa recently had a dvt and pulmonary embolisms which is how I'm getting my information. It is truly a scary thing and I can for sure sympathize with your fear as it is one that I have too. From what you've said it doesn't sound like a DVT to me but Im no doctor! Just keep a look out for any changes if you are worried about it. Also try to find some comfort in the 2 negative D dimmer tests. :-) I hope I helped a bit!