Paranoid??

So I am on day 4 of my period.I had sex twice both with condom.After the second time as my boyfriend was removing the condom off his penis,I saw that there was no sperm inside.I immediately filled the condom with water-no leaks.I also took and ovulation test-negative.I went to my gyno today because I already had an appointment about something else and I asked her to check if she see a follicule.As every doctor, she told me that she doesn’t see dominant follicule and she thinks that i shouldn’t take plan B, but she can’t guarantee(this didn’t calm me😂)However, I am still worried even though i don’t know why.The condom wasn’t broken so there is just no way for the sperm to come inside me.My bf told me that he felt an orgasm but he didn’t cum because he pulled out and that this somethings happens.I am just scared that the sperm leaked somehow