Hello and thanks for your query. I shall make an effort to provide you with good professional recommendations specific to your questions. Irregularities in menses can occur even in individual who will have regular periods. One of the earliest and simplest way to know that you are pregnant or not, is by using, urine pregnancy test. It s best to do the home pregnancy test first thing in the morning, when your urine is most concentrated and hCG levels are highest. So I advice you to perform a test a week after missed period and with morning sample of urine. This test kits are nearly 98% accurate, so reliable. With transvaginal ultrasonography, the diagnosis of pregnancy can be made earlier by 4-5 weeks gestation. If it turns to be positive, I advice you not to take any medication without consulting doctor, as all medications are external substances and they have their own side effects. Medical methods for first trimester abortion have been demonstrated to be both safe and effective. This includes the use of hormonal agents. This are prescription based agents, hence I can not suggest you here without the examination. Hence I advice you to see OBG specialist for examination and for further help. Yet again, I duly appreciate your query to me, I do hope that have found something useful to help you and I shall be glad to answer any further apprehensions. Sincerely,