helppppppp

im a huge hypochondriac when it comes to meds. I have to take amoxicillin but I’m scared im allergic all of a sudden. would I experience anaphylaxis after taking one dose? Or just rash the first time?

for example, if i take 500 mg tonight and then 500 mg tomorrow would i have a rash or something the first time and then if i continue to take it it would be more serious?