Is Plan B Advisable Continuously For Two Days?

I took Plan B yesterday morning just out of fear of getting pregnant the night before when my boyfriend and O had unprotected sex. Last night, he accidentally ejaculated in me so I took Plan B again this morning and now aim freaking out: 1) of fear of being pregnant; 2) if taking a plan B twice was dangers or ineffective; 3) my stomach kinda feels funny and I'm tired although the tiredness is probably from difficult sleeping for the past week - Is taking plan B two days in a row safe? Why is my lower abdomen feel funny?