18 days different same shirt. second picture I am 18 weeks pregnant

Tiffany
Only one baby, a bouncing boy! Many have said I may have my due date wrong... we planned and planned and after four months we finally become pregnant... so I KNOW my date is right! Many have said MAYBE twins??? And one is hiding... so I go June 5th for a very extensive ultra sound and we may see a second baby hiding... what do y'all think?!?! I am 18 weeks in second picture the first picture is only 16 days prior... by due date is October 9th 💙💙💙