Telling people the news

I'm 8 weeks today and have been having all day 'morning sickness' and low BP which is making me faint every now and then if I stand up to quick. It's got pretty noticeable at work so I bit the bullet and told people. I do have a high stress job so I was greatful for the support I've got from most colleagues but there are still those (generally older than me!) who seems to shudder when I say I'm only 8 weeks. Have I made a mistake telling people so soon? It's really bothering me. Thx ladies x