My LO is 4 mths and i just found out i'm pregnant again. LO is totally breastfed but my supply is getting lower and lower by the day. Does this mean i have to stop breastfeeding or can i take any supplement which is both safe for my LO and the baby?

Congratulations on a new blessing coming your way! Breastfeeding while pregnant is completely okay as long as you do not have any complications during pregnancy. Just continue to latch your little one. You may take supplements or eat galactagogues but it is not a guarantee that it will increase your milk. Breastmilk is supply and demand. The more you let baby latch, the more it will produce. You can refer to these sites to learn more on breastfeeding while pregnant and after you give birth, you can now experience tandem feeding