Anybody else

So,lately i have been clinging to my boyfriend like crazy, we have been together 3 years and have a little girl he loves to death who is 2 and we have another little girl on the way. Lately a new girl at his job got hired and she is all in what he looks for.long hair blue eyes,skinny,pretty girl her teeth are little messed up but aside from that,plus she is young like me. He gave me the password to his computer the other day well i went to get on it and it wasnt what he said,should i confront him he claims he changed it but didnt bother to give it to me...and back to the girl he said she is ugly to him but told him to be honest and now he says ahe aint ugly but shes not pretty either...im just mixed with emotions,i dont want to feel trapped by being pregnant to where he can do as he pleases and im just stuck fat like a whale...please help do yall think i am just hormonal and should relax or have a heart to heart with him?