Monthly Cycle seems to be changing

Hi I am Sarnor, I am 41 years old, have one child and is just trying to my second child n I am a Social worker.

For the past 4 months, my cycle has been changing days. My cycles days have been between 26-28 days but when i took clomid in October, my period jump to 38, days and 29 days in November. Although, I have been experiencing mixed cycle days, the good part is that my period still last for 5 days, the flow is good n the cramp is not much. Is there any cause to worry?