 [ Symptoms ] chances of being pregnant after having unprotected sex within the 10th 12th week of being on the depo shot  i first started getting the depo shot august of last year i received a shot on september 5th within the 10th and 12th week on that shot i had unprotected sex multiple times then i received the shot on november 28th recently i have been very tired all of the time i have been sleeping half of my day awake yesterday i woke up with a sharp pain in my lower abdomen that went away after a few minutes but felt severe i know there have been many women pregnant on the depo before [ Disease ] no canker sores aphthous ulcers resolve on their own over time lidocaine will not cure them but it takes away some of the discomfort during the natural healing process try using listerine and gargle with it for as long as you can stand it will burn but it will also heal any sores in your mouth or throat repeat 2 or 3 times a day the sores will be gone in no time can be followed by cold h2o to cool painful sores lidocaine is a topical analgesic it is a pain killer and really has no properties to cure anything it just makes it feel better while it heals