How Long Should I Wait?

I've just started taking Ovranette (literally, on Friday 19th I took my first pill) I've taken one every evening since.

Yesterday and this morning I've been feeling out of sorts, headachy and a bit sick. I know these are common side effects- but how long should they last before I go back/stop taking it? Do I just carry on even if the side effects persist? Will they persist all day everyday?

I've found lots of info online about what the side effects could be- but not really anywhere that says how long they will last, when to stop taking it/go back to the surgery.

Argh; I really wanted the pill to work for me but I do have alot of other things going on too!