Older Girl on Clomid

Hi, I am 40 and trying to get pregnant. This is my second cycle using clomid. My cycle length is usually 38 days, so my doctor prescribed Clomid 150 mgs day 7-9, 100 mg day 10 and 50 mg day 11. The ultrasound showed 4 follicles, only 1 is mature 21mm. If I do not get pregnant this cycle, he wants to increase my clomid intake. I have cramping now and I see flashing lights while taking this medication. I hope it works. Good luck to you. I am testing for the LH surge, so far, nothing.

Maria