Need advice

So I just found out I was pregnant a few days ago. I think I’m about 3-4 weeks right now. I have a 6 month old daughter as well. I wanted this second baby and I’m very happy to get it. My great grandmother was telling me that I didn’t need a second baby I just needed to have my daughter and that was it even after my daughter was born she suggested I get my tubes tied, I refused too because well I’m only 19 and I want kids. I wanted at least two and for them to grow close in age. Now that I found out I’m pregnant I don’t even wanna announce it to anybody until I’m at my third trimester. If I was to announce it now all my great grandmother would do is start drama saying I need to get an abortion or stress me out about it. She’s controlling and she tends to run her mouth a lot. I do love her but she would tell my family and only make my pregnancy hard for me. I live in California and my family lives in Texas they are supposed to be coming down here thanksgiving or Christmas. When she does I’ll barely be showing but she always try’s to come in the restroom where I am or follows me as well as tries to make me take my birth control pill(she thinks I’m currently still on my bcp) how do I hide it and do you ladies think I’m wrong for not wanting her or my family to know? Am I a bad mommy to my daughter for wanting another baby?