Hello thanks for your question.
Herbal tea is not going to do any things to your pregnancy
.However it does causes various side effects of which stomach upset
is most common and If it causes swelling of your stomach then why you want to take it.I being a Doctor feel sorry if your gynaecologist is not responding to your queries and is not taking your proper care.You are well come at Health care magic,we will respond to your each and every question to your satisfaction.Maintaining the confidenality of patient's information is Doctors top responsibiiity and I think no Doctor can divelge any parient's information which harms patients interist in any way.
Hope this answers your question.