Placenta coming loose from uterine wall

So this is my third pregnancy... I know they say each pregnancy is different but I'm really scared. I'm only 16 weeks as of today. I found out when I was like 7 or 8 weeks pregnant that my placenta was comong loose from my uterus. I was told there's nothing the OBGYN can do... Ever since I was told that I have been getting sharp pains on my left side. I was wondering if any of you other mama's are dealing with this as well.. And what you're able to do to keep the pain bearable. I also should mention I have a 3 and 5 year old as well... Any advice is welcome