@Tess England
It depends if you are claiming as single or not . Also if you aren’t it will Be based upon how much your partner earns as well. You can apply for universal credit now and when baby is here you can apply again if you declined while pregnant. You may be entitled to working tax credit. And unless you earn over soemtbing like 1000,000 you are entitled to child benefit which is around £100 a month x
If you go online and search benefits calculator it will tell you
You might want to say what country you’re in to get specific advice?