No longer responding to Clomid

[fmw9412]

Hi everyone

Brief history: didn't respond to Clomid 50mg but did on 100mg, third go resulted in pregnancy. Other Daughter conceived naturally.

January 2016 I took some more Clomid 100mg but no response.
I then have taken 100mg in Feb this year, no response and then this month 150mg and scan this morning confirmed no response again.

Does anyone know why I no longer respond to Clomid? I must admit that I do exercise a lot, I have done so for a number of years but in the last 6 months it has increased quite a bit.

The other thing which is confusing me is that despite my consultant informing me this morning that the lining had now thinned and there were no dominant follicles (I am on day 26), I am getting lots of twinges and backache!

Anyone else in the same boat?!

Any replies greatly appreciated! Thanks so much xx