HELP!!!! semi emergency!!!

So I just had a baby 2 months ago... my husband and I were having sex and I told him to pull out as I'm not on birth control yet (I know, not the most effective method, but it has worked without fail for 9 years). So what does my husband do??? Finished inside me and says that he forgot that he had to pull out! I'm freaking out. I haven't had a regular period yet but had some bleeding about 3 weeks ago and I'm breastfeeding my little one. 
What the hell do I do? I do NOT want to be pregnant right now! Should I take the morning after pill? Can I even take that while breastfeeding? Or am I likely to be fine since it was just one time and I'm breastfeeding? Husband has lost pull out privileges!!!