Thank you for putting up your problem to Healthcare Magic!
If you have history of regular good periods in the past and had unprotected sexual intercourse recently then you may be right.
You are at risk of having pregnancy
and you should rule it out.
Please do a home pregnancy test with the urine pregnancy kit which reasonably detects the pregnancy.
You need to start the treatment after consulting your gynecologist if pregnant.
I hope this information would be both informative and helpful for you