Possible medical error of pentacel

My son received Pentacel vaccine at 6 month check up.it was third Pentacel  for him. however I received call from nurse saying that he may not received the hib portion because nurse maybe forgot to mix the hib powder. They are not sure if nurse really forgot to mix it or not. Pediatrician said my son received diphtheria, tetanus, pertussis and poliomyelitis portion but not sure about hib portion.he recommend my son to come get hib in 4weeks when he will be 7month old. I am concerning the risk of getting extra hib in case he was actually received the hib portion because the extra dose he will get will be dose number 4 hib. I was reading CDC web and they recommend to have minimum of 8 weeks interval between hib dose 3 and 4.it said minimum recommended age for hib dose  4 is 12-15 month. Is it ok for my son to get the Hib in 4 weeks when he is 7month old? When should my son get next pentacel dose?
Here is the link I saw about interval of hib...

http://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/a/age-interval-table.pdf

[margypops]

I will refer you to the Immunization and Vaccine forum we have here on Med Help ..They may have some answers for you about this matter.I can understand your concern and I feel a second opinion from a Doctor would be in order before he has any further vaccination ..

[Happylulu1234]

I don't know how to submit question to vaccination forum.how to do it?

[margypops]

Go back to the forums page . the way you got here , there is a list of the forums, look to the left scroll down and you will see under i   the Immunizations and vaccinations forum .click on there as you did here.You may want to browse through them all see what you want to join  there are also many groups run by members .