IS IT OKAY FOR ME TO HAVE ORAL SEX WITH HALLS?

Ok so my husband loves giving me ORAL SEX but he loves it also with halls cough drops. Hell put it in his mouth then goes down on me and that just blows me away. But now in pregnant, 6 weeks 4 days and I just want to know if it's still fine for him to do it since he's been wanting to but I'm just not sure if it's okay? Can someone help ?