Plan b

My partner and I had protected sex Friday night and then it turned into unprotected sex and while he did pull out he was stressed out and we discussed about taking plan b and so then Saturday we had unprotected and today{Sunday} I took plan B! How effective do you think this is? He’s pulled out everytime but we wanna be safe than sorry and while pre cum can get you pregnant it’s very unlikely. My next period is supposed to start Jan 4th so should I calm down and not assume anything just yet?

Also those who have taken plan b what were your side effects? Mine is a headaches and being super tired and VERY EMOTIONAL! I’ve BEEN CRYING SO BAD TODAy. And I don’t know why!!!