Will I have another big baby?

Ok my first son was born 4weeks early and weighed 8lb 1oz
My second son weighed 10lb 9oz 6days late and my 3rd son weighed 11lb 2oz 6days early. 
I'm currently pregnant with my 4th son 21+6 and I'm terrified of having another big baby 😁 before getting pregnant I lost 7stone ( size 18 now) am eating healthy this time as I didn't before, i do have the odd junk food. What's the odds on another big baby? Also I'm 5'7 

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