HELP!!😳

Mercedes
Hi ladies,, I had unprotected sex 4 days after starting the pill (I'm taking the pill because I'm in the first steps of <a href="https://glowing.com/glow-fertility-program">IVF</a>) however today (exactly 10 days after unprotected sex) I started spotting a brown discharge,, I know it's wishful thinking, but is this discharge caused by the pill? Or possibly implantation bleeding?? I'm asking because I read that the pill could take up to 1 week to protect you from pregnancy and I had unprotected sex only 4 days after Beggining the pill😳 please let me know😥
SashaÂ