I had a sex with a boy it's been three weeks now is there is a Way to stop pregnancy.. Any medicine for this

Professional Medical Assessment: At 3 weeks post-intercourse, emergency contraception (Plan B/levonorgestrel) would no longer be effective, as these medications must be taken within 72 hours of unprotected intercourse. At this stage, the patient should obtain a pregnancy test, as sufficient time has passed for pregnancy detection through urine or blood hCG testing. If pregnancy is confirmed, the patient should promptly consult with a healthcare provider to discuss all available medical options and receive appropriate counseling regarding their reproductive choices, including referral to specialist care if needed. Additional testing indicated would include quantitative hCG levels, complete blood count, basic metabolic panel, and potentially a transvaginal ultrasound to confirm pregnancy location and viability once hCG reaches appropriate levels. Note: This is a sensitive medical situation requiring immediate professional medical consultation for proper evaluation and counseling. Please seek care from a licensed healthcare provider.

At 3 weeks post-intercourse, emergency contraception pills (Plan B) would no longer be effective since they must be taken within 72 hours. At this stage, you should take a pregnancy test to confirm if you are pregnant, as it has been enough time for a test to be accurate. If pregnancy is confirmed and you wish to prevent it, you may discuss medical abortion options like mifepristone and misoprostol which can be effective up to 10 weeks of pregnancy in most regions where legally available. For additional treatment recommendations, ask in the chat.