Negative with No period

I'm on a cycle enforced with progesterone and clomid. I was originally put on these drugs because I didn't get my period after my first finished nursing. The first month it didn't work I didn't get a period the second month it did and I was like yipee and now I don't have a period again I'm almost a week late and pregnancy test are still negative. I really don't know if I'm writing this for support or answers I just figured glow was where I should turn