Get your health question answered instantly from our pool of 18000+ doctors from over 80 specialties

186 Doctors Online
Doctor Image
Dr. Andrew Rynne

Family Physician

Exp 50 years

I will be looking into your question and guiding you through the process. Please write your question below.

Can plan B cause irregular periods?

Answered by
Dr. Shanti Vennam


Practicing since :1989

Answered : 7332 Questions

Posted on Thu, 5 Dec 2013 in Birth Control
Question: hello, I had unprotected sex on Aug 21st early early morning, twelve hours later I took the Plan B pill. On Sept 5th I got my period. It was regular flow, cramps, bloating and last longer. I have not had unprotected sex since then. Now Nov 13th and still no period. So basically I skipped my period for october and so far no period for Nov yet. I have taken at least 6 home preg test last one was around Oct 30th all negative, I went to the doctor last week because I had strep throat on Nov 5th explained to my reg Dr. my situation and he had me take a blood preg test. That also was neg. My nipples are sensative and my cysts in my breast started hurting two weeks ago but I figured my hormones are all out of wack and I keep thinking that they are a sign that my period is coming. Im on levothroxine also (I dont have a thryoid). I have two kids so I think I would know if I was pregnant especially by now. Im stressed over this and I know this probaly isnt helping with my period. I figured Im not pregnant since all test are negative and by now the tests should be accurate. Can the plan B screw up your cycle like this?
Answered by Dr. Shanti Vennam 45 minutes later
Brief Answer: So much disturbance has not been noted usually. Detailed Answer: Hello, Thanks for writing to us. Emergency contraception is very much effective when it is taken within the stipulated time interval. As it contains excess hormone, it tends to disturb the menstrual cycle as the hormonal balance is tampered with. The usual menstrual cycle may be delayed by about a week or two after inducing a withdrawal bleed a week after ingesting the pill; prolonged absence of a menstrual period calls for further investigation. In the current scenario, I would suggest a complete evaluation by a gynecologist along with a trans-vaginal sonogram. Since pregnancy has been excluded through a blood test, you may be going through a phase of hormonal imbalance and you would need a complete hormonal profile including the thyroid profile. Your symptoms point to hormone excess and stress could be adding to all. As far as my experience goes, Plan B does not cause so much of disturbance and you need to be investigated to manage further. Please maintain a healthy weight, some form of regular exercise and a healthy diet. You may need hormones for inducing withdrawal bleeding and later on for setting the cycle back on track. Hope your query has been answered. Please feel free to contact for further clarifications. I will be happy to help. regards, Shanti.V.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

The User accepted the expert's answer

Share on
Question is related to
Diseases and Conditions ,  

Recent questions on  Combined oral contraceptive pill

doctor1 MD

Hi, I've been on ovranette for about four years as my dr thinks that my periods were causing my epileptic seizures, over the last few weeks I've had some bleeding every few days. I don't follow the four week cycle, I'm prescribed the pill for every day without a seven day break so why am I bleeding?

doctor1 MD

About a year ago, I started seeing white spots on my legs...they have multiplied rapidly. The dermatologist diagnosed it as Vitiligo. I am currently applying Pigmento ointment (charak). I was sent Vitiligo 30 sublingual pills from Biogetica, as well as Pigmento Tablets. I am a breast cancer survivor (2), and have had reconstruction. I am 68, and 5 4 tall...weigh 154 lbs. I am really scared to ingest the pills for fear that it will do liver damage. One of the pills contain Arsen Sulph . How harmful is this? Please advise. Thank you. Juliet

doctor1 MD

Hi me and my bf had unprotected sex last month before my period and due to my work schedule I wasn t able to visit the clinic until the following Monday which was the fifth day afterwards after I took the pill I had sore breast, hot flashes and lower back pain then I got what I thought was my period which was extremely lighter then normal and brown. Usually my period last about 6or 7 days this last time it was about 4 to 5 pasty, dark brown, and some days wouldn t bleed at all then spot the next. I took a test (a cheap 99 cent store one) and it said negative. This month it s time for me to have my period again and I have no signs of it coming. No bloating, salt craving, mood swing, sharp pains...nothing. I m not pregnant right??

doctor1 MD

i went and got the levest 150/30 pill, im just wondering does it work as a contraceptive straight away? the nurse also told me to start taking it on my first day of my period does this mean i will come on a week early or should i take another weeks after the packet is finished?

doctor1 MD

i am currently on depo provera and have bled for weeks non stop i will be going on holiday soon can i take norethisterone to stop the bleeding? And will this prevent me from bleeding during or after sex? i will be reunited with my fiance after not...

doctor1 MD

Hi I am XXXX. I had sex with my girlfriend last month Oct 14th,15th and 16th. She first took a contraceptive pill considering we have done for all. But again we made love within 4 hours of her taking the pill. so I forced her take another pill too...

doctor1 MD

Hi I'm XXXX.37 yrs old. I have 2 problem is irregular and painful periods. ..Dr. suggest me novelon tablets. ..I'm taking novelon 3 days but till now periods on..why