 [ Symptoms ] am i pregnant  so i gave my boyfriend a handjob and he precummed a tiny bit then fingered me i am scared that i could be pregnant and it keeps me up at night please help [ Disease ] fortunately dangerous side effects or reactions to vaccines are few and rare reactions that are life threatening or result in lasting disability are very rare however it is important to note that vaccines like any other medical product potentially come with some risk no matter how small one type of rare serious reaction is anaphylaxis a severe allergic reaction it occurs on the order of approximately one case per million doses of vaccinations administered in case of severe allergic reactions including anaphylaxis urgent emergency treatment is required