Antibiotic and BC pill

Patient : Hi! I'm 29 y.o. woman taking Yasmin for a few years and I was prescribed by the dermatologist Doxycycline 100mg a day for 2 months. Can this antibiotic reduce effectiveness of my BC pill? I took Doxycycline for 4 days already and I'm on my 3rd pill of Yasmin from this package (7th say of the cycle). I had unprotected sex today and I wonder if I need the morning after pill? Thank you very much!
Symptoms:  None
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