do I have a right to be mad?

To start off I’m about 6/7 weeks prego and my hormones are everywhere. I’m emotional as it is because I had a baby 8months ago and I’m currently prego again so anyways I’ll start with what happened.

I have had a friend for about 15 years I’m 24 so we met when we were 9 this girl has always been different she was home schooled she had rarely any friends growing up her mom sheltered her so much trying to protect her that she ended up doing wrong by her because at the age of 24 she still doesn’t know how to drive, read nor work. She’s not mentally ill she just legit doesn’t care this is all normal to her because it’s how she’s grown up to be so anyways I’ll nickname her “Tina” so Tina had been having issues with an ex bf and her house wasn’t a good place to be because the bf used to live with her and he would beat her even with her parents home. So Tina has always been a family friend she grew on me when we were young kinda became like sisters because she was at my house 24/7 she would only go home like every other day to change and she lived 2 blocks over so anyways back to what happened. She was having issues with her ex so she asked to come stay at my house. This is completely normal to me and our family cuz like I said she’s been like family since forever. 

My dad brother and my babies dad all live in the house. So I told Tina she can come here she was supposed to be leaving to Arizona In a month with her other friend who was going to let her live there and help her try to find a job. So she came for a week left to see her mom for the weekend and than came back Monday. Monday night everyone was drinking including my uncle who came over from Victorville 2 hours away and his car broke down so he was staying over. I was in my room with my baby and Tina was in here with me I tried keeping her company but around 1:30 I dozed off so I woke up at 2 and I can hear her in the dining room with everyone talking and laughing so I was like ok wel apparently she wasn’t tired. She was supposed to sleep in my room. So I dozed back off and woke up at 4 and my babies dad was laying in bed with me so I was like ok she must have stayed on the couch because originally he was supposed to sleep on the couch and her with me. So I always get up to pee around that time and I got up to go and saw her blanket on there which it looked like she was laying there but I couldn’t see her face so I went and pulled off the blanket and she wasn’t there. My uncle was on the other end of the living room knocked out on the floor.  I knew something happened so I went to ask my brother and he was still up playing his Xbox like a weirdo so he said she wasn’t in his room and that he had just seen her 20min prior because they smoked together. So now I really got mad because the only other room in our house is my dads. I was so scared and nervous to knock because I didn’t want this to be true but I knocked twice and no answer so I layed down called and texted him and no answer so I asked my brother to please knock and make sure she wasn’t in there. He came to my room and said my dad said she was supposably sleeping on the floor in my dads room because since my uncle was spending the night and he was on the living room floor he didn’t want her to stay there by him cuz my uncle doesn’t know her well like we all do. Bullshit. So my brother told her to get out of my dads room and come to mine. When I saw her I just knew. So yes she slept with my dad as in the had sex, I asked her if at any point she said no and she said she didn’t. I was trying to stay so calm because of my baby sleeping on the bed and mainly I didn’t want to cause a miscarriage or something scary happen to my baby that I’m currently pregnant with. She begged me to hit her and I told her she was stupid so she was sitting on my bed at this time and dramatically threw herself off my bed backwards like a freak which I then woke up my babies dad to get her out of my room before I do something stupid. So I stand up he gets her up and she comes rushing me trying to hug me crying, I lost it I started screaming hysterically pushing her off and my babies dad finally got her out of my face. I was so mad I cried all night and couldn’t go back to sleep so I didn’t even sleep until last night. Her ass went back home and I’ll never speak to her again. Now, my dad on the other hand...I’m just so pissed off I don’t even know what I’ll say to him. We own a business together which to make short was only a benefit to him because he had tax issues with his other company. So I helping him out decided to open a new business doing what he does but under my name. Now he texted me yesterday like nothing happened, I haven’t seen him since that night that they were drinking nor responded to his text about work yesterday. I feel like he must think I’m so stupid to act like nothing happened. I decided to go to my moms yesterday to avoid him and she lives 2 hours away so I couldn’t go today because my babies dad works for our company and he had to work today. I just feel that him and her both broke so much trust. They ruined a 15 year friendship and my relationship with my dad which we were close. I don’t know how I can forgive them or even face him. As far as the business I want nothing to do with it I’d leave everything right now if I could and I’d move out of his house and go to my moms until we can get our own place. But What is the rational thing to do because I feel so stuck and any advice is better than thinking I have to just put up with it. Thanks if you read everything.