I have been taking Norethistterone 5mg tablets as i bleed nearly every day for the past yr and a half. usually when i stop taking them my period starts within a day. I had unprotected sex with my partner 5 days ago. i stopped taking the tablets 4 days ago and have had no signs of a period and noticed my nipples are darker and bigger, could i be pregnanat and is it possible to have sysptoms this early? how soon should i take a test?

Thanks