My mom is trying to destroy my relationship now that im pregnant & Im starting to have second thoughts?

Im 25 and i've been with my partner for a year and a half, He is 39 and i love him so much, Im from the US and he is Russian but lives in London. I was previously engaged but that ended a few months before i met my new partner as he had cheated on me and i left him. My partner wants me to move to London to live with him as he is based there because of his business, He also has homes in Russia, Monaco & Italy, When i first met him he kept clinging to me to let him take me out but i didn't give in until a month after we met as i didn't want him thinking he could click his fingers and he'd have me, I see now that that was pretty childish. He is so affectionate & always tells me that he feels like he cant be without me for even a second & that he does be miserable without me. When we are together he always touches me, holds my hand, kisses me, puts his head level with mine & tells me he loves me, how happy i make him & that he would sacrifice anything to see me smile. He has proposed to me last month but i told him i wasn't ready, He told me he wasn't going to stop asking until i said yes. My mom doesn't like him and says that he doesn't love me as much as i think & that im just blinded by his money & that i wouldn't know what true love is like if it hit me in the face, which is a lie,I swear to god, I love that man like crazy. I found out two days ago that im two months pregnant with our first child and i was so excited about it until my mom lectured me and now im afraid to tell him about it as my mom has gotten into my head making me think he may not really love me as i once thought, or is it just hormones making me like this? Advice Needed?