Matches do not matter, only weigh-ins. If you certified at 152 and weighed in there half of the time you can wrestle 152. You may have been bumped a lot and have twice as many matches at 160, but if half your weigh-ins were at 152, then you can wrestle 152 at regionals.
Also, you can always go up. You may make 152 all year and wrestle all your matches there and then wrestle 160 at regionals.