Plan B is currently available over the counter, and you can find coupons for it online for various retailers; some of those coupons require a prescription so check the coupon details carefully. Both of these medications can be ordered online.
Plan B and Afterpill in the 1.5mg tablets are less effective for people over 176 pounds, however it is safe to double the dose, so if you are heavier order two doses. Ella is also effective for heavier people, but requires a prescription.
Emergency contraception is effective for a short period after sex. You need to take Plan B or Afterpill within 72 hours of unprotected sex to prevent pregnancy.
IUDs and birth control implants are effective long-term birth control that does not require your partner to participate in using the birth control or even be aware of it. IUDs are 99% effective and are effective for 3-12 years depending on type. Planned Parenthood can place an IUD for you, and so can many gynecologist's offices, and IUDs are covered under most health insurance plans. Talk to your doctor or gynecologist about how to get an IUD. Birth control implants are 99% effective and are effective for up to 5 years. Like IUDs, you can talk to your doctor or gynecologist, or visit Planned Parenthood, to get an IUD.
The birth control methods listed here are not effective for preventing STIs, they are for pregnancy prevention only.
If you can become pregnant but do not want to be pregnant, now is a good time to consider a long-term birth control option like an IUD or a birth control implant, and to purchase emergency contraception like Plan B or Afterpill to have it onhand in an emergency.
Lots of people in this country don't get a good education about birth control or their bodies. Here is Scarleteen's comprehensive, accessible guide to birth control and how it works.