1st round of Clomid, late AF but negative pregnancy tests..Help!!

Took my 1st round of Clomid this month, 100 mg on days 3-5. AF is usually always on time (28 days) now I’m on day 34 of my cycle and no sign of AF. 3 negative pregnancy tests.., I’m so confused, can Clomid be the cause? Anyone else experienced this? I don’t wanna get my hopes up.
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