Etonogestrel
"Been on it for about 4 months now so maybe things haven't stabilized. I'll say that it's effective, I haven't gotten pregnant. First month was great, no side effects at all. Immediately after the first month, however, I started spotting enough to need to wear a panty liner all day, and I've been constantly spotting since. No periods, just constant spotting. It's annoying but I guess it could be worse. No other side effects that I've noticed."