Miscarried and pregnant again in last then a month!!!

Octavia
Hi.. I'm 31 pregnant with baby #3, my youngest is 9 so its been a while for me... I'm worried cus I just experience a early miscarried last month 4-13-16 and Now I'm pregnant again this month 5-13-16 I'm excited of course but I'm like how could that be.... And as of the last 3 days I have been spotting every other trip to the bathroom and its really light spotting... I go to the doctor on Monday I'm hoping and praying everything is okay!!!!