Pain n blood after vaginal swab.

Earlier today during check up,doc do this vaginal swab as currently i'm on 35 weeks pregnant.Right after the swab,i went to toilet and discover there's a blood.When i reach home,i went to toilet again n there still a blood after i urine.After 2 hrs seems like normal only thing when i urinate it feels pain. Is it common to have blood after this vaginal swab and pain.#advicepls