Understanding Irregular Bleeding After Hypothyroidism Treatment

Question
Hi Dr. Harriet Johnson,
       I am 22 years old and was diagnosed with hypothyroidism two months ago.  A month ago blood work was done and my levels were back to normal.  My last period was exactly 28 days and lasted for approximately 6 days.  I have always had a little bit of spotting between my periods for approximately a day.  However, this month on day 19 of my cycle I had more blood than usual.  I knew it was not my period because it only lasted for a few hours.  Slight cramping accompanied this blood as well.  I am now 6 days late for my period.  I have taken multiple pregnancy test and all have come back negative.  For the past week I have been getting cramps and my back and breasts are sore.  These are normal symptoms that I get before I get my period, but I haven't gotten my period yet.  I know these symptoms are also associated with pregnancy.  This is mine and my husband's first month trying to conceive and I am wondering if it is possible that I am pregnant?

Answer
Hi Christina,

I think you may be pregnant. The bleeding you experienced could have been implantation bleeding. If the pregnancy hormones aren't yet strong enough, you won't get a positive test. I advise you to keep testing and if it continues to be negative and you don't get your period, visit your doctor for a more accurate blood test.