If you don't have a family history of neural tube issues (e.g. spina bifida), it is recommended that you take 500 micrograms (0.5 milligrams) of folic acid per day when trying to conceive and for the first trimester of pregnancy.

Check on the packet, but pretty sure that Blackmores contain this amount of folic acid and you won't need an extra supplement.

Women who have had a previous child with a neural tube issue, or have family history (self,sibling etc) are advised to take a higher dose of folic acid.

congrats on your pregnancy!