If it's within 5 days of unprotected sex you can still take emergency contraception. You can take Plan B if it's been up to 3 days after sex or Ella One if it's been 3-5 days. It's very effective at stopping pregnancy. While you're at the pharmacy get some condoms, and then speak to your doctor about getting on a long-acting form of birth control like an IUD or implant so you don't have to remember to take a pill every day
Or even the weekly patch or ring might work better for you.