Can Infection In Jaws And Gums Enter The Blood Stream?

hi last night i was having a really bad pain in my gums, my cheek is sore, pus is coming out of my gums, i feel a bit of headache and feels like i have a fever and swollen lymph node and worst thing i cant open my jaw chew and swallow. it doesn't really hurt it's just my gum is bugging me and my swollen jaw. i called my dentist and told me to come in early in the morning. while i was there, they wanted to get my xray done but was having difficulty because i cannot open my mouth. so the just checked the infected area and was prescribed penicillin. as for someone who has hypochondria i am super scared pf what ive been reading online that infection can go in my bloodstream. my question is, what is the chance that infection will go in ky bloodstream . since i got checked by my dentist 20 hours after the infection shows up. and how long does penicillin will it take for penicillin to effect. thank you