Hi !! I Was Exited When I Was With My

Hi !! I was exited when i was with my gf and we didn't have sex but I inserted my penis tip into her vagina once and then took it back. I was scared and gave her a postinor within 2 hours. She firstly got brown discharges after 3 or 4 days and got her period on the same week as expected but the bleeding was high and stopped . after a day she got brown discharges again and she told me that she has a bitter taste could she be pregnant??