Late period post cycle 2 of clomid but no BFP?

Hey ladies,
Could really use some advice on this if you can...I've just completed our second round of clomid at 100mg/day for CD 3-7...now it's CD 33 with no sign of my period or pregnancy (took a test this morning and it was negative :( could it be too early for HCG to be registering on the test? How long to wait before I test again? Any thoughts are much appreciated and welcomed!