Blood count

Jessica • Boy mom 👦🏼💙👶🏼
I was in the hospital on 1/2 for dehydration from the flu. They took my blood and came back and said my platelet count was slightly low and they would retest in month. So it's been a month and I got it tested again on Tuesday. I just heard from the nurse and she said they dropped a little more but I'm "still okay" and the doctor signed off on it. 
Have any of you experienced this before? I'm really confused as to why this is happening and if I should be worried. I didn't have this problem until this month and never had it when I was pregnant with my son 3 years ago.