Is it common to have stomach pains, gas, and frequent trips to the toilet in the early morning during pregnancy? What could be causing these symptoms?

Yes it is normal. Stomach pain could be because of implantation that is taking place and the diarrhoea and flatulence is due to hormonal changes. You will experience alot of changes the first 3 months of pregnancy but will later adapt. If the pain continues for a long time and is severe please get medical attention. Congratulations