I was anxious about getting the vaccine, too @Loo87. I waited a few months after I was eligible to get my first dose.
I had Moderna both times (only had my second dose two months ago so not eligible for a booster yet).
The first dose I had a VERY painful arm for about three days. So painful it was agony to lift it and I couldn't sleep the first night as every time I moved it hurt. Many people I know had the same. Painkillers didn't touch it.
The second dose I had a slightly aching arm that developed within the first hour. That night I was up all night with chills and uncontrollable shaking. I then had flu symptoms for about 24 hours afterwards. I was still able to leave the house and get on with my day but I wouldn't have been able to work as I was exhausted. My friends who had all had Moderna before me warned me I would feel shit after the second dose, so I made sure I booked my second dose for a Saturday so that I had Sunday to recover.
So, honestly, I think it's likely you will have some sort of reaction, but whatever happens, it's short lived and really not that bad. If you're feeling anxious when you go to the appointment, tell the person vaccinating you and they'll talk you through your worries. I had a lovely woman for my first vaccine who saw the terror in my eyes, put the needle down, and chatted me through my concerns before she vaccinated me. At no point was I pressured to go ahead if I didn't want to.
My advice would be to make sure you have someone who can help you with your baby the day after your jab, just in case.
And for the people being unpleasant and saying 'it'll be worse if you get covid - just get jabbed' - the OP doesn't need to hear that. She's not here to be judged, she's here asking people about side effects so she can prepare herself. Getting the vaccine is not a straightforward decision for everyone. A bit of compassion and support goes a long way.