Ideally, there is no need for you to start taking any medications prior to conceiving, trying to conceive or even earlier stages of pregnancy. Medications are suggested only if you are suffering from an underlying problem like lack of vitamins, low levels of hemoglobin, etc.
Usually, most people go for a general health check up once they conceive and if the gynecologist finds underlying deficiencies, then medications are started. However, in people where there is a medical history that showcases any genetic disease or tendency to have some sort of deficiency, you can go for a check up prior to trying.
Unless you have been on a particular medication for some time - say calcium pills or multivitamin medicines, you should not start anything new before consulting a doctor. There’s a chance that you may be over-medicating yourself, which implies risks for the mother and the unborn child. As long as you are eating a healthy and sensible diet, which is high on nutrients and fit for a normal person, there’s no need to worry.
But in cases you have symptoms like dizziness or feel weak and lethargic, etc. you can start on some of these safe medications-
Iron supplements or folic acid - A pill a day should suffice your basic needs and is ideal for women who have low iron diets or issues with hemoglobin levels. Levels lower than 12 grams per deciliter is not good.
Multivitamins - There are many safe and natural multivitamin pills available in the market that you can consume on a daily basis for overall health.
Avoid taking anything that comes with warning signs of consulting doctors before consuming. And there’s no harm in getting a general check up to be on the safe side and know what medications to consume.