TMI photo. Help.

I have been having pains on and off all day. I chalked it up to Braxton-Hicks. This is my 4th child. (7th pregnancy) I went to the bathroom tonight and lost two chunks like in the photo. I went into labor with my youngest son at 27 weeks so I’m a little worried but not sure if I should be since there’s no blood or anything and I only lost little pieces of the plug. I’m 17 weeks so I don’t think they will do anything at the hospital for me. Would you be worried? I don’t have the number for my OB after hours but I could go to the hospital and they can contact him. Thanks in advance.