6 month old not meeting all milestones?

We have 6 month old appt on her 6 month anniversary this Friday. I am concerned bc she isn't rolling from her back to her stomach, she isn't bearing any weight at all on her feet when I hold her up. I recently got a bouncer to try and show her she could straighten and bend her legs to move herself up and down. Not working. She is also doesn't use consonants and doesn't appear to copy me often. She will babble and is very smiley and social. Am I concerned over nothing? I hope so. Please share. Thanks.