My sister is a hair stylist and she said you can color your hair while your pregnant, but it may not come out right. She said that your hormones may have a counter react with the color and it may not come out like it's suppose to. So, I think it's fine. I hope you get your BFP soon! Good luck
You can use stool softners like colase but should try to stay away from laxatives and as for the hair dye thats up to you personally I think its fine, but some peope are against it. All my friends dyed their hair during pregnancy and went on to have healthy babies. I say just relax and live a little have a drink color your hair don't worry about anything until you actually get that BFP........