Help is needed please xx

Hi my names Danielle I'm 28 and have a wee 4 year old called Sophie may she's my world . Me and my fiancé got a big surprise 8 days ago when I rang him crying down the phone that I was pregnant I don't mean to sound like a bad person but I didn't want to believe it .. I'm pooping my pants tbh .. With Sophie may I had a very bad experience giving birth she was a big 9 ponder and tbh i still haven't forgotten the pain . We went to the doctors last week and she told me I was 7 weeks . Tbh I don't feel one bit pregnant no sore boobs not feeling sick . And deep down I think there nothing there . Can anyone please help me ? Thank u xxx