Getting a tattoo for my little Saturn who I lost at 8 weeks

I had an ectopic pregnancy in July...ever since we lost our little Saturn I've been wanting to get a tattoo for her (I say her because the day before I found out I was pregnant I had a dream of hold a little girl in my arms) but my mom thinks it's a stupid idea. We got into it tonight because she thinks i should just "move on" and "get over it". She acts like my baby didnt even exists because i never got to hold her. My mother has never lost a child so she doesnt understand the pain I've gone through, my SO and i had been trying for 3 years before we got pregnant again (we had a miscarriage when we first got together) so it was especially hard to have to choose to terminate because at this point I wouldn't care if I died just to bring a baby into the world...my mother wasnt even happy when we told her that we were pregnant in the first place because she doesnt like my SO and has been trying to get me to break up with him sense she found out that he did heroin from age 15-19 (he was 19 when we met and I helped him through detox and helped him stop using drugs, hes been sober for 5 years come April). Shes constantly talking down to him and treating him like shit it drives me crazy...anyway she thinks it's stupid to get a tattoo for "something that didn't even exist"...I'm just so upset..I want to get my Saturn tattoo on my due date which was March 13th..it's only been 4 months and she acts like I shouldn't even be upset about it anymore...what have you ladies done to make your family understand how much you're hurting when they havent been through what you have...