Can clomid (clomiphene) and progynova make your period light?

Possibly: Clomid (clomiphene) is used to stimulate ovarian function and Progesterone is used to try to support the early pregnancy (assuming fertilization has occurred) if the egg is not fertilized then menses will ensure a couple weeks later but it is normally normal to slightly heavy. If it is light, check for pregnancy as it may be implantation bleeding.