Peer pressure while pregnant

Half of my family are what you would call “know it all’s” and if I ACTUALLY stand up for myself they always degrade me and push me to do things anyways and I have the hardest time saying no to people.

I’m 21, I live on my own, and already have a daughter. She’s 2, I just found out I am pregnant with baby #3 (my boyfriend has a son).

I have not announced my pregnancy yet and don’t plan to until after my first appointment in July. With my first pregnancy with my daughter i got pregnant in June and I was 18. July is the county fair and a family member around my age kept telling me I was fine to get on fair rides, I told her I did not feel comfortable because I was still very early in pregnancy and I had terrible cramps already. She proceeded to tell me that I am perfectly fine, the baby is too small to be harmed, and I’m acting like a baby about it. (She has never had kids) anyways I didn’t do it even though she made me feel stupid and childish.

Another incident with my first pregnancy, the same family member that told me I could ride the rides insisted that I bleached her hair while 21 weeks pregnant. Again I told her I did not feel comfortable doing so because I am not supposed to be breathing those types of chemicals. At this time I was at her house and she still lives with her mom. Her mom is the same way she is. And when I spoke up about not wanting to do it her mom over heard and said “oh quit being a baby. You’ll be fine just open the window.” If you understand anything about not sticking up for yourself in front of not one but two people you would know that I had no response back and ended up doing her hair with the constant worry of my baby.

Maybe some women feel like those types of things are not harmful to a fetus. But to me i did not feel comfortable.

After that I stopped answering texts asking me to hang out with her and I stopped going around them. I was tired of getting told I don’t know anything about pregnancy and that whenever I said no it was an invalid answer.

This time around she does not know I’m pregnant. And she’s asked me multiple times to go out and drink. And now she’s asking me to go on the bull float in August. (If you don’t know what that is, it’s a huge float in my home town and any year you go you can’t even see the river because there is so many tubes, rafts, and kayaks. It is packed to the brim.) and I just know they will try and pressure me into it. My boyfriend is someone who don’t take no shit from anybody, he has no filter and I know he will open his mouth and I’m kind of scared for the conflict between my family and him.

I also feel like it should be my place and not put him in a situation like that, any advice on what to say whenever someone tries to pressure you into doing something?