Hiya,
Just wanted to jump in and tell you that my doc recomends a baby aspirin every day to help with the lining, I don't know the exact amount but its low dose or baby aspirin and it helps thicken the lining for the egg to implant!! I think he said its taken for the entire first trimester but I'm not positive about that.
My AF got light when I was on them and then they did get heavier with the low dose aspirin, I took a break from Clomid because I was bloating horribly from them, took a break had an ultrasound and HSG went to an IVF clinic only to be told we're both fine and that doc put me back on Clomid for a bit to see if it'll happen.