Yes I have annual scans, usually around 4mm, at one stage was 7mm when I was only on 100mg x 7 days so have upped it to 10 days now. I think my body is super sensitive to any changes, I get breakthrough bleeds, if I adjust my oestrogel dosage too much as well sigh....I am due another scan soon, so will be interesting to see, but last one I had was doing well on the 100mg x 10 days with a 4mm lining, but as I say, the moment I push past 4 weeks, I breakthrough and it could be that by then my lining is thicker and it sheds by itself as in Mary G's case... My last Utrogestan was started on 2nd April and today I have a bleed sigh...will start them immediately, thankyou Mary G for your reassurance it is much appreciated, we certainly do sound similiar in that respect. x