Hi Lin & congrats, it's fine to carry on breastfeeding whilst pregnant. As hayls mentioned about the colostrum in the second trimester, apparantly it can taste strange and your lo may not like it.
I'm 6 weeks pregnant and have a 10 month old. I was sure I would carry on bf until he was 12 months but I now have awful morning sickness (all day), am exhausted and really struggling to eat so wondering if bf whilst eating so little is a good idea. I would feel really sad to stop now but feel so rubbish I may have to

Don't want to put you off though, you will probably be fine in which case carry on feeding your lo as long as you want.x