No no no no no.
Where on earth did you hear that seeyoukay and detoxdiva? Quite worrying!
The only difference between normal sickness absence and pg-related sickness absence is that pg-related sickness absence can't be counted against you in terms of possible disciplinary action for absence, or when selecting for redundancy.
There's absolutely no need for an employer to suspend someone on full pay just because they are ill and not fit for work.
I would really like to know where you heard that.
If, after a H&S risk assessment, it is found that there are health and safety risks for a pregnant woman if she continues to do her job, then adjustments must be made to that job. If adjustments are not possible, then alternative work must be found for her.
In the very unlikely event that it is not possible to make adjustments to the job and there is literally no work available for the woman to do, then it may be necessary to suspend her on full pay.
None of which is remotely relevant here, but seemingly necessary to post.
nisha in answer to your questions you must be given paid time off for antenatal appointments, yes.
In terms of your sickness there's nothing to worry about. The OH adviser will be able to make sure your manager knows to what extent your illness is affecting you and will be able to advise that either you should be signed off work completely, or that adjustments to your tasks or working arrangements could be made.
If your manager is concerned that you may not be fit to work, she is absolutely right to get professional advice to ensure that she handles the situation properly, doesn't let you work if you are not fit, and is fully informed about your condition.