Hello I Had Sex Three Days Ago With My Bf

Hello I had sex three days ago with my bf but the condom broke and I'm not sure if any semen went inside me but I took the 1st postinor tablet after 10-15mins and the 2nd tablet after 6 hours. Will it still work even if I didn't take the 2nd tablet earlier than 12 hours? Are there any side effects or any signs that will show that it worked besides waiting for my period?