You will have to check at your clinic to see if they will give you Plan B to take with you. Often youth and STI clinics have Plan B available for when a risk of pregnancy has happened but they would give you the pills to take at the clinic and may not give them to you to take away.
If you have had issues with condoms in the past, having Plan B on hand is a good backup but you may have to pay for it. It is available at most pharmacies or you can check with Options for Sexual Health as they usually have lower prices for Plan B and other forms of Birth Control.
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