I had unprotected sex with my bf on 24 Apr, he entered the sperm inside so I took i-pill after 3-4 hours immediately but I didn't had any side effects for the following days at all. On 15 May I had sex again but I didn't take any pills cause he ejaculated the sperm outside. But after few days I started to feel weak, feeling discomfort in my abdomen and back pain. I am suppose to get my due periods this month 20th May but I'm not getting till now month of May last week so still waiting for it. But I'm totally confused I don't know what happened I've never experienced like this before. Is it because of the side effects of the pills or any other problems? Please kindly help me I'm really stressed out. I need to know as soon as possible.