Due earlier??

I have this weird feeling that I may be due earlier than my drs think. I wasnt able to give a date of my last period so it was all a guessing game. Both ultrasounds I got his measurements were both a week or 2 ahead my dr is just going off a guess of when I may have had my last period but I honestly cant even remember if I had a period in March at all. I wish I could remember and get a more accurate date. I'm having 3rd baby syndrome where I just dont remember things like this 😂 I never really paid much attention to my period anyway so I know that's not much of a help. I also have 1 doctor in my office say I'm a week ahead then a different doctor will stop in to see me and say im a totally different week than what the other one said 🤦‍♀️ I just feel so confused and wanna be prepared since most people tell me your 3rd comes quicker.