Am I being bullied?

[Starlive22]

I can't BELIEVE I'm going to write this, at 33 years of age, but I think I'm being bullied by a co-worker...
I've worked at my current employment (solicitors practice can you believe!) for 2 years, I work in a room with 2 other women, both senior to me and both have been there 15+years.
It all started when I got pregnant earlier this year, one of my coworkers has changed towards me completely. Unfortunately my pregnancy hasn't been as straightforward as I'd have liked so I've had to have a bit of time off sick (unpaid) and it's stemmed from there really.
It's hard to pin her down to one behaviour as she's quite nice when others are around but basically telling me not to be babyish when I've asked about pregnancy related aches and pains, eye rolling, bringing up morbid topics such as preterm labour and stillbirth. Leaving me out of secret Santa, Xmas meals etc. They have gradually gone out of their way to push me out, and when I've brought it up to both them and my boss I've been told I'm hormonal, and that's the end of it.

I don't want to start maternity early but feel it's my only choice. DH says this is her essentially taking money from our baby but as I intend to find a new job after the baby is born I don't mind.

Anyone else has this? It's literally since I've been pregnant, before that although I found her difficult I never had any actual problems with her.

I know I need to grow a pair... but how?

The HR manager is lovely, but works in a different branch, and bats all the problems back to the senior partner
Was just thinking about you...I would construct your letter/email of the suggestions above and what has been going on and sent it to the HR manager who may be lovely but as a HR professional should understand that it’s their responsibility to handle this appropriately on behalf of the organisation.
I learnt a very valuable lesson...HR are there to protect the organisation NOT the individual (that’s my experience anyway!)..by letting HR know and putting it in writing you protect yourself by showing you followed reporting procedures and they will not have ‘deniyability’...this way they ALL become complicit in the racism and bullying.
If you email put a delivery and read receipt on it. DO NOT discuss over the phone, make sure all communication is in or followed up in writing I.e. if they call you, email to say “further to our telephone conversation today at 11:05...etc...etc”.
Please don’t do nothing. I have experienced something similar twice; the first time I did nothing and was forced out (still bugs me to this day).
The second time I followed my own advice above. I still left the organisation but walked away on my terms with a payoff (enhanced voluntary redundancy, paid gardening leave, notice pay and all owed annual leave) my reference.
Good luck for tomorrow