How Can Irregular Menstruation Be Regularized?

Dear Sir/Madam, I am 22 yrs old female of having weight 50kg. I had a sex two months before, unfortunately I got the mensuration problem. I have already done the pregnancy test, it is negative. I am hesitating to consult the doctors. My friends were suggested me to take krimson 35 tablets. Is it the write medicine? Could you suggest some exercises or medicines to get back my proper mensuration? Thanks in advance> I am eagerly waiting for your reply!