AITAH For Not Letting My Pregnant Sister Sleep In My Bed?

Edit:
Posted and update. Thanks guys!

Original post:
I (26M) rent a small two-bedroom apartment. I live alone, but I use the second bedroom as my office because I work from home full-time.
My older sister, "Lily" (31F), is 6 months pregnant and soon to be single mother.
She has some issues with her apartment (in a disagreement with her landlord, and in the process of moving out), so she asked if she could stay with me for a few weeks. Of course, I said yes and that I would be happy to accomodate her for as long as she needs.

She moved in last weekend, and the first thing she did when settling in was pointing towards my bed and saying: "I'll take this one." I laughed, thinking she was joking. Only later in the evening when I asked her if she needs anything else before going to bed did she mention that she was not joking about wanting to sleep in my bed.

Now I'm a little bit of a germophob, and I am quite uncomfortable with the idea of other people sleeping in my bed.
I told her that I am uncomfortable letting anyone else sleep in my bed. But I will gladly set her up with my guest bed (which I did use to sleep on before buying my current bed, and I know for a fact is very comfortable and spacious).
Then, she started guilt tripping me saying that since she got pregnant she's having problems falling asleep and that she needs the bigger more comfortable bed.

I stood my ground and told her I was happy to accommodate her, but I wasn’t giving up my bedroom. She sulked, but she took the guest bed.

That lasted exactly two nights before she started complaining that the bed was “too stiff” and that she “couldn’t sleep.” I offered to buy a new mattress topper, but she refused. Instead, she tried to pull the "you’re my brother, you should want to make me comfortable" guilt trip again...

I told her that she is lucky I can even take her in, since I work 10 hours a day from home and I do value having a work enviroment that's private, calm and quiet.

She called me selfish and accused me of not caring about her or her baby. I told her she could take the couch if the guest bed was that unbearable.
Well, she did... but exactly for 1 night before turning into an absolute menace.
In the second night on the couch, she made sure to sigh loudly all night, "accidentally" bump into things, and complain the next morning about how "horrible" I was making her feel.

The following day, she kept making calls and talking loudly on the phone while I was working.
I didn't pay attention to the actual calls and what she was saying, but later it became very clear...
In the evening I started getting phone calls from most if not all of my family members.
Apparently, she was ranting all day on the phone to my family about how rude and how horrible I was making her feel, trying to make my family put pressure on me just to let her sleep in my bed... Like she's on a mission or something..

My mom took her side and tore me a new one on the phone saying that Lily is carrying a child and I'm being inconsiderate, she also said "I thought I taught you better hospitality than this, I am very disappointed".
My aunt called to tell me that my uncle (her husband) used to sleep on the couch and sometimes on the floor next to her when she was pregnant.
Even my cousin (who I haven't spoken to in like 2 years) called to tell me I'm being selfish.

My father is taking my side telling me to ignore them and that my sister is a fuck up that she got in that situation in the first place... But I feel like my mom is giving him a super hard time in the background because he did sound kind of hesitant when I asked him to have my back.

Honestly I'm just feeling like I'm in the middle of a soap opera drama.

My mom is threatening to come take Lily home (yea like that's much of a threat haha) but she's giving me such a hard time and telling me I disappointed her and that she raised me better..

I don't know how to feel about this anymore..
AITAH for not letting my pregnant sister sleep in my bed?