TTC AND USIN CLOMID

I'm 35 no kids I have pcos.. I'm on my 2nd cycle of clomid at 75mg I also started to use the opk on Saturday which came out no LH then Sunday and this morning Came out a flashing smiley which mean I'm startin to ovulate.. ne advice to how long it will take for clomid to actually work and nethin I should due to help