4m, unprotected sex

Got a little crazy with hubby last night. I'm 4m postpartum and breastfeeding. <sometimes I need to supplement > We didn't use protection and he didn't pull out... Now I'm freaking out and running to get plan b. I had a hard time conceiving my recent baby and we used soft cups to do so (ttc for 3yr)... Am I freaking out for no reason? it was only that one time... But sometimes that's all it takes right lol

Sigh.. Like two teenagers last night... We should of used our heads lol