On January 6, 2018, I had protected sex but he ejaculated while still inside of me. I took a Plan B the next day just to be safe. I started having some light pink spotting on Jan 16 (around the time to get my normal period) then it turned into mainly brown blood/discharge for the next 4 days. I only had normal red period blood for one day. It was SUPER light. Every since then, my right ovary has had this pressure feeling ache. Could I be pregnant or what could be causing this?