Lor mee should be fine during your first trimester as long as it's freshly cooked and from a clean place. The main thing is just being careful about food hygiene during pregnancy since you're more prone to food poisoning, so avoid roadside stalls if you're unsure about their standards. If you're worried about any specific ingredient or how you're feeling after eating it, might be good to check with your PD just to be safe, but generally it's not a food you need to avoid.
Why cannot though? I thought should be fine.