My H left me when I was 3 mths PG,I moved into a flat,and had all the benefits I was entitled to.Being Pg with my DS,finally put things into perspective for me.I was married to a loser,an "eternal Peter pan",but although I had put up with it,I wanted more for my baby.
It wasn't easy but I learnt to budget well,and my Ex H paid money each month which i put away,and that paid for our 2 week holiday in Cornwall each year with my family.
When my DS was 6 I met someone,who I eventually married,and had 2 DD's with.My DS is now 13 yrs old,has contact with his Dad,but is part of a secure loving family.
It was very scary initially,but once my DS arrived,I just coped because I had to.I had just enough to live on,and topped up with a very part-time job,when my Mum looked after my DS.
Although its scary as this is a new phase in your life,next year will be very different,you will cope because you have to,your DC needs you to be strong,and being a mum you will become a strong person.
If your DP has left you at this stage,you are well rid,as I was,and deserve to have a partner who values you and your DC-to -be.