"so i cannot vouch for effectiveness since i just got it today but i wanted to share this. i have never had a child so i read the reviews below and was terrified about the pain people claim lasted 24 hours to a few days. i will admit the pain at insertion was so surprising i got lightheaded. about 20 minutes after insertion the cramping has subsided and i don&#039;t feel as awful as i thought i would. mild cramping but that&#039;s about it."