Afraid of getting PPD/PPA when baby #3 comes

I used to live with MIL when my first child was born. That caused so many problems for me and caused fights between DH and I. Examples are: taking my baby from me, snatching my baby right after breastfeeding, TRYING TO BREASTFEED MY BABY just so she won’t have to give me back my baby, making me do chores for her so she could bond with my baby instead of her helping me recover and bond with my own child, etc. We moved out after my DH saw that my mental health was suffering and I begged him to please just move us out even though financially, we’d be living under a very tight budget. We made it work! During this time, COVID lockdown happened and I basked in the moment without having to see my MIL much. It was a time for me to recover from my PPD and PPA and spend time with my child. Two years later, had my second baby (still during lockdown) and it was great! I didn’t have MIL trying to take over my position as a mother, trying to smother my kids and take them from me. Fast forward to now . I am heavily pregnant with #3, MIL found out where we live (DH ended up giving her our address because she “wanted to drop off a gift for child #1” whom she was obsessed with). She found out we only lived 10 minutes away. Now she keeps trying to come over boldly and without announcing she’s coming over. I try not to make a fuss about it but really, she is triggering my anxiety. Several times already, she’s tried taking my kids out by herself and I made sure my DH was with them because I do not trust her alone with my kids after all the things she’s done to me in the past. Every year, she goes on a trip for a couple months. And one of these days that she came unannounced, we were having breakfast and I happened to ask her about her trip. She told me “truthfully, I didn’t book this year because I feel you need my help with 3 kids. Someone told me it’s going to be rough, so I’ll be coming over every week to help you out!” OMG that really triggered my anxiety and honestly, I was angry that she just decided to do this without even asking. I was able to care for 2 kids ON MY OWN (and with DH of course) without ANY help. Why would one more kid suddenly make me want her help?! I don’t want to bring it up to DH to upset him but I really need him to help me to tell her to back off. Other than that, my parents are finally coming to see me after a few years of not being able to visit. So they’ll be here to help me out during the postpartum phase. I don’t need an extra person, especially one that doesn’t respect my boundaries to “help out” when it is not needed. After my parents leave, I am sure I will be able to establish a good routine by the time baby #3 is three to four months old. My eldest child is now of an age to help me out and not too troublesome. It’s just my rambunctious #2 who we decided will stay in daycare to help me manage my time and routine. I don’t freakin need my MIL to step in and ruin things for me again.