Should I go into work

I'm almost 8 weeks pregnant, feeling nauseous, exhausted and emotional. I have suffered with pre and post natal depression before and general anxiety. My job requires me to carry out full days of training for staff as well as other desk work. I've always had a bit of anxiety and nerves before doing training but since becoming pregnant it's getting worse to the point I'm sweating, have diarrhoea and heart palpitations. It's making me really upset and I'm worried about stress on the baby. I have a backup for tomorrow's session if needed but they have already covered so much for me and they have a crazy busy week ahead. I feel too guilty asking them to step in yet again. Not sure if I should just try and go in and do the training tomorrow or get the help?