"i have been taking this for a year. i switched from another birth control pill, which i was on for 10 years. since the switch my period has been non-existent. i have always been regular, but not with this pill. at first i was very nervous each month, even taking pregnancy tests. other than the irregularity this pill has very little side effects. it has helped with mood swings i was having on my old pill. i have not gained weight, and my skin seems clearer. i saw my gyno today, and she said the lo loestrin fe has the smallest amount of estrogen, so it makes the uterus so thin, it just doesn&#039;t bleed. she says it is perfectly healthy and normal, so i am ok with that. i just know the week i go on vacation, i will get a period!"