Hi, I came off the pill about 2 or 3 months ago and was due to come on my period around the 19th August. I was going on holiday that day and so wanted to prevent my period. I took two pregnancy tests in the week leading up to this (one a week before which won't of worked because it was a test that detects up to 4 days before missed period (didn't realise, thought I'd got a 7 day one) then took another one 4 days before which also came back negative). As they were negative I expected my period to come so went to the doctors for norethisterone to stop it. I am now back from my holiday and took the last tablet saturday morning, it is now wed and no period. The doctor said I would come on two days after stopping the pills. I have been back off holiday since Monday morning and have felt ill since with a bad stomach which started while I was away and have a constant dull headache and feel dehydrated. Could I be pregant but was too early for the tests to detect? Am also worried as to the effects of the norethisterone if I am. Any advice much appreciated, thanks!