Talking ibuprofen once while ttc isn't going to hurt anything. And actually my doctor told me to take it recently in second tri. I asked them about it and she said definitely not third tri, didn't say anything about first tri, but sometimes the benefits outweigh the risk in second tri. I didn't end up taking it because it still freaked me out, but it just depends.
Op, just take Tylenol if you're that worried about it.