Can a softcup suck sperm out of cervix?

This may be a really stupid question but I had sed yesterday morning with my bf and after I put in my menstrual cup because I read that can help keep the sperm inside, but when i took it out this morning it had suctioned itself to my cervix and I had to pull really hard to get it out. Fluid was in it which I expected but also stringy egg white discharge. So is it possible for a sperm to go inside the cervix but be pulled back out from suction?