Yes.
I had unprotected sex on the 25 to 27 April and my period started on the 30april and lasted 5days. My next period was supposed to start on Tue 24th may but it was late for 4days,on the 5th day I had light period. Could I be pregnant?
This sounds like an ask.com question.
Yes. At the very least, buy a home test kit ..... Better yet, see a doctor.
If that is the only sex you had, then it is unlikely. But there is still a chance. There is also chance you have an infection that can be effecting your cycle. There is also a possibility of stress, diet, or other factors effecting your hormones, thus changing your cycle. Take a home pregnancy test. If negative and you continue have problems see your doctor. If positive, see your doctor.
There is always the chance when you play.