HELP!!!

hello po, ask ko lang mga mamsh kung ok lang ba manganak nako sa sept 20? unang patak kasi ng mens ko is january 5 po at huling patak january 12. kung bibilangin po sya magiging due date ko is Oct 12. Pero Nung unang ultrasound ko po sept 26 lumabas sa due date ko, and yung last na ultrasound ko duedate ko is sept 28.. Ok lang po ba sya non??? pls need your opinion po :)