Need some advice.

Jay
So, I'm 7 weeks pregnant at the moment and right now only immediate family know. I don't really want to tell work until I'm 13 weeks because my manager is very unprofessional and the whole team would know within minutes meaning I'd have to tell EVERYONE! But here's the deal, my morning sickness is quite bad and I already have a bit of a bump showing, a couple of coworkers have asked if I'm pregnant too and I've had to lie which made me feel bad as I'm really excited and would love to tell people. My job isn't massively strenuous, I work in a clothing retailer in the UK; however, three days a week I have to lift and unpack up to 30 very heavy and large totes full of shoes. My 8 week appointment is on Tuesday and I'm wondering if I should tell work after that. Any opinions would be really appreciated! I just don't know what to do?!?