MIL and morning sickness

[Splinters]

I love my PILs -- very kind, caring people. However, I haven't worked out how to get MIL to stop asking questions about how I'm feeling. The answer, frankly, is shit, but I really don't want to talk about it, or even think about wetting myself as I vomit up brilliant yellow bile every morning, more than I have to. I've tried a few noncommittal kinds of answers like 'oh, you know, getting there I hope' over the phone, but this inevitably leads to 'right, and what does that mean?', so that I find myself rapidly asking if she'd like to talk to DH now..

We're going to see them for the weekend. What do I do? I probably can't just say 'fine, thanks', as it is not at all unlikely that I will be sick at some point while we're there. I'm thinking of something like, 'I don't really want to talk about it as I'll end up turning into a terminal whinger ha ha ha' or something of the sort, but has anyone got a better idea?

Tell them that you appreciate their concern, but that you find talking about how you're feeling actually makes you feel worse. Thank her for worrying about you, but that you will tell her if there's anything important to tell, you're just suffering badly with morning sickness.

Why don't you say "fine, thank you" or if its necessary for her to know you aren't well (trip planned or something) then say "I've got morning sickness", or am I missing something?
Telling her you have morning sickness should let her know exactly what is wrong without asking further.
Oh, do you mean you are trying to hide you are pregnant from her?

No, she knows I'm pregnant, she knows I've been being sick, but she wants to talk about it and I really don't..

When she asks how you are, just reply "pregnant!" with a big grin?? It's normal to be sick when you're pregnant so asking for details is frankly a bit bizarre! (though fwiw I'm sure she's just trying to be friendly/interested)

Or reply "it makes me feel sick to discuss being sick, so lets not"

Just be honest!
Say "frankly I feel shit and don't want to talk about it"

Then if she persists, say "I don't want to talk about it"

Repeat as necessary.

"I'm still getting the morning sickness, and I'm afraid I've found that talking about it, makes it worse"

get your husband to have a quiet word with her to let her know you appriciate the concern but don't want to talk about it, I know the feeling I hate random family members asking questions if I have something to tell them I'll tell them...