HELP.

My baby is 2 days old and I've been trying to just breastfeed. But I haven't produced enough yet of course he drinks about 4ML a feeding and I'm no where near that. I've been supplementing with formula but now he doesn't latch on as good as before. I'm so lost at what to do. I want to breastfeed him of course. Should I pump? I'm going to get fenugreek pills tomorrow and I've been drinking lots of water. I don't know what I'm doing wrong. 
Of course before I even try to give him formula I breastfeed and he feeds but not enough to fill him up. I don't want him to scream all night so I give him the formula 
Ladies please I need your advice as to what to do.