Help??

Guys ik this sounds crazy but pls give advice?

I feel some kind of string inside my vagina. I felt it while showering.. it almost has the consistency of hair. I want to pull on it but it’s a bit difficult I can probably try if I lay down in bed but I’m scared of going into shock or something going terribly wrong. I went to my OB and told him directly, it felt like some kind of string of hair or something that could be pulled out and he looked inside and said nothing was there just that my cervix dropped. Help?

33weeks