Clomid

So last month was my first time at clomid. Now this month has come around and Im waiting on AF to come or to get the BFP. AF should have been here Wednesday the 17th and I still have no sign of her. Ive taking 3 hpt and they have all come back negative. My cycle is usually between 27-30 days. What I would like to know is if you tried Clomid has it messed with your cycle any??