12 hour shifts

I'm only 6 weeks and 1d I work 12hour days 4 days a week is anyone else finding it hard with tiredness I'm co stalky tired and feel dizzy me and my husband have been talking I no I'm not far but I have been thinking of halving my days as I don't want to put too much pressure on this pregnancy after haveibg our sillborn son last September I want to make sure I am in the best of health for this pregnancy what are people's views?