As a man I'm happy. I would put up with back pain to get LL. But if risk of blot clots is not negligible for women, is musicmaker at risk, for example? Poor girl
It's probably an insignificant (practically speaking) increase (if any) in the risk of blood clots. Women double their risk of getting blood clots just going on birth control pills (due to the estrogen content) but even when you tell them this, most are happy to keep taking their birth control pills, because the total risk is still very low. Pregnancy has the highest risk of all. But women don't avoid getting pregnant just because they're afraid of blood clots.
To put the numbers in perspective, if you take 10,000 women at random, 4-5 of them will have blood clots each year. If you put those 10,000 on birth control pills, 8-9 will have blood clots. If you get those 10,000 pregnant, 29 will develop blood clots during pregnancy and 300-400 will develop blood clots immediately after delivery.
Women are prone to blood clots in general. If a woman really wants to avoid blood clots (DVT), she should get a progesterone IUD put in and avoid birth control pills. That's probably what I would do for contraception if I was a woman. Pregnancy is the by far greatest risk a woman can take for DVT. But most DVT's don't really cause too much trouble anyway. Leg lengthening is almost certainly a minimally relevant contributor to the risk.
KiloKAHN, like you're suggesting, I'm sure your back pain will subside once your muscles balance out a bit better. You're still in the middle of things.