Is It Safe To Take A Second Morning-after Pill After Having Unprotected Sex During Ovulation With One Taken 20 Minutes Earlier?

Hello, I am an 18 year old girl. I had sex without a condom and my boyfriend came inside. 20 minutes later I took the morning after pill. However, it is worth mentioning that I had been ovulating for 7 days and the semen was still inside when I took it and for 20 more minutes. I m afraid it won t be effective and I m thinking about taking another one. Could you tell me if it is safe please? I m desperate