I'd like to echo what chrishoney said, and add to it that you should listen to your body, see its response.
As an example, here's what happened to me a couple of nights ago to further emphasize that point.
I've increased my estrogen dosage from two pills to three a day, and took the pair of them in the evening. My right leg became extremely hot after a few minutes, and I googled the cause. One of the possibilities was a blood clot. Having done nothing that night, I wanted to see if the same happened the next, being in disbelief that at the age of 22, I would actually be clotting. But I was. To see if it really was a blood clot, I took an aspirin and it almost immediately relieved the warmth, and the feeling went back to normal. So now I take one estrogen pill in the morning, one in the afternoon and one in the evening to solve the issue, and haven't had it resurface since.
Again, listen to your body and how it responds to the drugs, even if you're on a doctor-prescribed regiment.