After Enlightenment - 7 Weeks (Sath Sathiya)
There was a possibility that Buddha stayed in Uruvela forest more than four(4) weeks. It was mentioned in Mahavagga Pali, section 6, end of paragraph 10 but it did not specify exactly 3 weeks more or places of additional weeks. The last line of that paragraph here



did mention Buddha stayed more than four(4) weeks probably made the best timing for five foremost monks for first discourse. 

If found about this more details in any sutta, I'll update here.