To be honest with you I do not know.
Just do the usual things to keep germ free and you should be fine. At the end of the day this experience may boost your immune system rather than weaken it. I'm sure you will be fine - if someone was really unwell they would not feel like swimming - and I guess chlorine does have some germ killing properties or health and safety would crack down on all pools before you can say emetophobia!
I hope you stay well but i as you know, f you are worried you know you can post on here and someone will respond quickly.
<font face=\"Arial, Helvetica, sans-serif\">Reach for the moon - even if you miss you\'ll be amongst the stars...</font>