I feel sick during sex sometimes.. I am 16 weeks along, but thats only when I get a seriously bad migrain...
But the sex and the adrenaline you get from sexy helps my headaches go away for a bit.
If it gets too bad you can see your GP..
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How far along are you? By sick do you mean you get nasous? Many women get sick during the first trimester afterwards because they aren't feeling the best to begin with.