I had a DVT decades past, in my 20's - I was not on a contraceptive pill and I was very active, cycling, swimming and on my feet most of the day teaching, when I first felt the pain it was like a bad cramp gone so wrong, I ended up having that doppler test, back of my leg was hot to the touch, I was kept overnight in hospital while they tried to get the right strength blood thinning tablet before sending me home, i had to attend gp regular (too regular for my liking ) for INR blood tests, that would lead to a call to say either increase or decrease my warfarin intake until next blood test - I'm no longer on these thankfully :)