“Dear Experts, I am currently on birth control – the kind that goes in your arm. Lately I have a lot of unprotected sex. How would I know if I’m pregnant or not?”
If you are using Nexplanon, then you are protected against pregnancy for 3 years. If you are getting Depo Provera injections, then you are protected against pregnancy for 3 months. As long as you have not delayed getting an injection (over 3 months) or getting the implant replaced (over 3 years) you should be protected against pregnancy. A urine pregnancy test will give you reassurance, if you feel you need that test.
Another issues is having unprotected sex puts you at an increased risk of getting a sexually transmitted infection (STI). Latex condoms can protect against STIs and will offer additional protection against an unintended pregnancy. Most health departments will give free condoms along with instructions on the proper care and use of condoms.
Hope this helps.