question: Hi I had my second cycle of IUI treatment on 20th march. My day 28 was due on weds last week. I ve not had any spotting. Just a little bit of brown mucus this afternoon when I wiped. I m taking 1 pessarie a night. (I ve had Chlomide day 2-6 of my cycle. ) yesterday I had a strange twinge pulling sensation behind my belly button. My pregnancy test this morning was negative. I have a huge headache. Could it be late implantation? Or my period delayed by the cyclogest pessaries an my period trying to start? Thanks Sarah