Whoever is a resident of Jeddah and wants to do Hajj or `Umrah may enter Ihram from Jeddah, because it is regarded as being within the Haram zone, so the ruling on its people is the same as the ruling on those who reside near Makkah, and are closer [to Makkah] than the Miqat, so they enter Ihram from the place where they formed the intention to do Hajj or `Umrah.

If someone goes to Makkah but does not intend to do Hajj or `Umrah, such as a business man, mailman and the like, he does not have to enter Ihram unless he wants to do that.

Based on that: If you entered ihram for ‘umrah and had formed the intention to do the rituals after crossing this distance, and the like, then there is no blame on you, in sha Allah, and your ‘umrah is valid. It does not seem that you have to do anything.