The Shepherd's Purse

Alder buckthorn - cathartic	Mugwort - emmenagogue
Angelica - emmenagogue	Nutmeg - slightly toxic (safe for cooking)
Barberry - uterine stimulant	Osha - emmenagogue
Birthroot - uterine astringent	Parsley - emmenagogue (safe for cooking)
Blessed thistle - strong bitter	Pennyroyal - emmenagogue
Butternut - laxative	Pleurisy root - cardiac stimulant
Cascara sagrada - laxative	Rhubarb - laxative
Coltsfoot - possibly fetotoxic	Rue - emmenagogue
Damiana - nervous system and hormonal activity	Sage - emmenagogue, hormonal activity (safe for cooking)
Drug Aloe - cathartic	Sarsaparilla (hormonal activity)
Ephedra - high alkaloid content, cardiac stimulant	Scotch broom - cardiac stimulant
Feverfew - emmenagogue	Senna - laxative
Goldenseal - uterine stimulant	Shepherd's purse - hemostatic
Gotu Kola - affects nervous system	Tansy - emmenagogue
Juniper berries - possibly fetotoxic, affects kidneys	Wormwood - emmenagogue

NO NOs

The herbs in this list are to be avoided during pregnancy. Keep in mind that some professional herbalists may prescribe one or two of these in specific cases, but I'm listing them here because serious problems could arise if these are used by a novice especially during the first three months.

alcoholic tinctures of any herb
arbor vitae (Thuja occidentalis)
black cohosh (Cimicifuga racemosa)
buchu (Barosma betulina)
Chinese angelica (Angelica sinensis)
Chinese rhubarb (Rheum palmatum)
dan shen (Salvia miltiorrhiza)
devil's claw (Harpagophytum procumbens)
elecampane (Inula helenium)
feverfew (Tanacetum parthenium)
ginseng (Panax ginseng)
juniper (Juniperus communis)
licorice (Glycyrrhiza glabra)
motherwort (Leonurus cardiaca)
myrrh (Commiphora molmol)
pennyroyal (Mentha pulegium)
prickly ash (Zanthoxylum americanum)
senna (Cassia senna)
shepherd's purse, (Capsella bursa-pastoris)
vervain (Verbena officinalis)
white peony (Paeonia lactiflora)
wild yam (Dioscorea villosa)
wormwood (Artemisia absinthium)
yarrow (Achillea millefolium)
yellow dock (Rumex crispus)