drinking beer on weekends if you are ttc can harm the baby if you got pregnant?

kay • mommy of a 6 year old princess 👑 3 mcs ... and finally pregnant with rainbow 🌈🙏🏼 due Oct 2 -18
we are ttc again i stopped bc pills last week and this is my fertile week but my husband doesnt want to cum inside because he's scared if i got pregnant and we have been drinking beers for the couple of months just weekends like 6-9 each of us and i would like to know if i got pregnant can it harm the baby? how long does the alcohol last in you system? he says that he wants to be clean so he can be able to cum inside .. but he knows that i have problems with conceiving and this month i know im ovulating and i think im wasting this moment 😏 yesterday we got in a fight and he told me OKAY i will cum inside but if the baby comes with a problem is all your fault 😧