feel really alone need someone to talk to

Hello, basically I'm a 18 year old girl. I found out I'm pregnant about 3 weeks ago and I'm nearly 7 weeks pregnant and I have a early scan next week just to reassure me. I have all the support in the world from my mum and her side of the family. My boyfriend Was happy, he's 20. We are both Being supported. ( well I thought so ) in the last couple of days, my boyfriend has been having a wobble saying he doesn't know about this. We have been together for the past 3 years. I know circumstances Are different for everyone but for me, I think an abortion isn't a way of contraception so I want to go ahead with it. His mother is manipulating me saying it's best if I get rid of it. I feel so alone. I don't want my mum to know because she's abit of a hot head when it comes to this and I don't want her to say anything. I just don't know what to do. I feel so alone and dressed because all I've ever wanted was to get pregnant and now everything is ruining it