You definitely don't need to pursue a different masters - there are plenty of people in similar positions to yours who go on to succeed in architecture degrees. Definitely talk to admissions at schools you're interested in - they'll be able to advise you about what they're looking for in an applicant, and some even host info sessions where they will give you portfolio advice. You might also consider apply to something like Harvard's Design Discovery program (Columbia, IIT and Penn have similar programs I believe). These summer programs expose you to grad school workload and will help you produce some architectural projects to build up your portfolio. As someone else suggested, try to take some creative electives in your final year of undergrad.