Antibiotics for Endocarditis Prevention

[Karina]

A couple of days ago I cut myself with rusty and very used garden scissors, a small but deep slash which required 3 stitches. I am 55 and have always taken antibiotics before dental cleanings and invasive medical procedures for MVP with minor regurgitation. The cut was cleaned, covered and I was given a tetanus shot. 12 hours later, I took 2 gr. of amoxicillin on my own, then 12 hours later, another 2 gr. , then 12 hours later, 1 gr. because it was a weekend and I could not contact any Dr. When I finally did talk to an emergency physician, he told me that I didn't need to take antibiotics unless the cut showed signs of infection, but I am still worried. Is this standard procedure for dirty cuts? I also worry that taking antibiotics every 6 months for dental cleanings will create antibiotic resistance.