Have a look on the net for Surestart Centres, most people have one nearby.
Ring them up and ask them to send you some leaflets or pop in there to get some, I have 3 near me and they are all really friendly.
They have mum and baby sessions, baby yoga, baby massage, other classes etc, all free of charge where I go.
I met some new friends at baby massage when my baby was 6 weeks old and we still get together now he is 9 months old.
You might meet some nice people at antenatal class if you are going to one and could call round to each others houses when the babies arrive.
I take baby to swimbabes once a week which is good.
Me and some ladies from my estate started a ladies that lunch club - we just got talking in the street while walking with our prams, we were all in the same boat, had been working full time and didn't know other ladies with babies. We started eating out once a week and then we changed it to each others houses in turn, the host would make sandwiches and all the babies could have a play or sleep or be held by someone else to give you a rest while the mums had a good chat.
There is also a buggy fit class near me where you pay £1.50 and do exercises with your buggy in a park (maybe no good for winter but when spring comes around might be nice!), look on the net, there may be one near you.
Local libraries have baby and toddler sessions you can go to for free too.
I moved to a new area and didn't know anyone and all my old workmates were 25 miles away but many new mums are on the lookout for new friends so it's easy to get chatting.
Love Karen
x