text: birth control pill question? about 2 hours and 5 minutes after my first pill of my birth control pill pack (i've been on the pill for 1 yr or so), i had a bowel movement that was a little soft and very easy to pass...it was still formed but it seemed pretty soft.   i have ibs but i usually don't have diarrhea...just abnormal stools (sometimes, thinner, flatter).   would a soft but formed bowel movement be diarrhea? would this have affected my pill?? this would not effect how effective your birth control pills are at all.  personally, you are slightly paranoid about this. relax. as long as you take your pills daily you are fine. unless you throw up/vomit 30 minutes or less after taking your pill the pill is ingested properely. if you still remain concerned you should use a back up method such as condoms with your pills.