Can women drink coffee during their periods / pregnancy ?

Basically, YES!

I am coffee addicted, admittedly!
So I usually look for some scientific information about caffeine effects to human, particular women.

And these are som information that people often misunderstand:



1. Is that a bad idea to drink coffee when you are on periods? 
According to Jim Anderson and Sandy Knauf (an expert and a certified Family Nurse Practitioner) you basically can drink it. Base on your understanding about your issue during that day, if you usually get hard-sleep, menstrual cramps, so should avoid. Otherwise, it's fine, even have some benefits during your periods.
Sources: https://www.quora.com/Can-women-drink-coffee-during-their-periods
              https://www.ubykotex.com/en-us/periods/period-advice/is-drinking-coffee-a-bad-idea-when-you-are-on-your-period


2. Is safe for pregnant women when they drink coffee ? 

First, drinking coffee too much lead to lower birth weight for your lovely baby (Women's Health)
Second, you can reduce intake until 140g (filter coffee), 100g (instant coffee)... (National Health System) Besides, water can help your body reduce caffein inside.
Sources: http://www.nhs.uk/chq/pages/limit-caffeine-during-pregnancy.aspx?categoryid=54&subcategoryid=130
              https://www.quora.com/Can-a-pregnant-woman-drink-some-coffee-If-its-fine-how-much


Sum up, the answer is Yes, you can drink coffee in these days with different dose above.