Took levonelle approx 7 weeks ago. I had a horrendous period 2 weeks later ( a week later than when I was due, which I know is normal) and thought great it worked. Now, do your periods go back to normal after that first one or can they be irregular for a while as if based on my previous cycle which was clockwork, I should have had my period a week ago and there is still no sign. I've had some of my usual PM signs but just nothing coming. I just wondered if anyone else's subsequent periods were interrupted and it took longer for their bodies to go back to normal or whether I should be going to my local chemists in the morning!!! I'm just a bit paranoid as my friends sister is a couple of weeks off having her first baby after taking the morning after pill!!!