Sounds like the first 3 months are how long the changes being made need to settle. If your period doesn't come back, then you might want to try Watson Labs - Zovia 1/35e-21.
Top 5 side effects experienced by people in long term use:
Zovia 1/35e-21 (Watson Labs)
1 Intestinal Haemorrhage
2 Irritable Bowel Syndrome
3 Inflammatory Bowel Disease
4 Colitis
5 Depression
Loestrin 24 Fe (Warner Chilcott)
1 Breast Cancer
2 Breast Cancer Female
3 Cerebrovascular Accident (Stroke)
4 Headache
5 Depression
http://www.ehealthme.com/compare_drug_interactions_side_e...#
Here's from the Loestrin website:
Loestrin® 24 Fe is different from most birth control pills in that you take 24 active pills instead of 21. Because of the hormones in the 3 extra white, active pills of Loestrin® 24 Fe, your period may last fewer days, and your uterine lining may not build up as much, so there may be less menstrual flow. Loestrin® 24 Fe is clinically proven to shorten periods (averaging fewer than 3 days) and lighten periods (with less bleeding).
You may experience light bleeding or spotting between your monthly periods during the first 1 to 3 pill packs. However, do not stop taking your birth control pills – the light bleeding or spotting will usually go away. See your doctor if light bleeding or spotting continues after 3 months or if bleeding is persistent or prolonged.