Pink after sex?

This is my second month of ttc with femara. I have diagnosed endometriosis and to get pregnant the first time we ended up doing femara with IUI. We are trying to just use femara for a few months to see if it works without the IUI. Husband and I BD on CD23 (not trying obviously cuz it's not the right time) but afterwards i went to the bathroom and what comes out is normally just clearish/whitish but this time around it was showing pink. I have bled after sex before but it's usually actual blood and common for Endo. Is this normal? I have had nothing since and took a test today for it to be BFN. Could I still be too early? Expected period in 5 days.