Help, pink spotting after intercouse

Me and my girlfriend had unprotected sex earlier this week, 10 hours passed and we got a plan b pill, we then had sex again today, this time WITH a condom, and soon after, she had minor pink spotting, is that natural, or could she be pregnant, she hasnt had sex in a while and were both still kind of virgins, any help would be appreciated, the faster we know, the faster we can get used to the idea that were gonna be parents, thanks a bunch