I have thyroid problem since 2016 Jan. For 7 years, I have had regular 28 days Menstruation cycle but from last April, I have started to witness Irregular Menstruation, eg, cycle after 34 days or 38 days. Recently, I had my period on 28the feb - 5 March. On 8 march, I took a birth control pill (i-pill), I started witnessing brown discharge after 6 days of taking the pill. And on the day of ovulation starts, I got my period again, ie, 18 march. Because of which I am feeling weakness. Kindly help if there are any complications or is this normal? P.s : This was my first time having a pill. I am 23 yrs old.