I plan on dating a girl for 2 months solid and then getting married if those two months workout. Will this plan backfire?

If she is living with me most of the time over those 2 months I think this short time frame is enough to make an informed decision. What do you think? and what if any tests should I put her through? or are tests unnecessary?

I plan on dating a girl for 2 months solid and then getting married if those two months workout. Will this plan backfire?
Yes, it will backfire badly
No, it will probably work out great
Other
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I plan on dating a girl for 2 months solid and then getting married if those two months workout. Will this plan backfire?
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