I have two back-to-back itineraries (business trip -> personal trip) coming up next month. Can I check my luggage in on two itineraries? Here's my schedule:

UA 443 DEN-LAX 2:45pm - 4:03pm
UA 6177(?) LAX-SNA 6:09pm - 6:36pm (end of itinerary 1)
UA 6177(?) SNA-LAX 6:52pm - 7:20pm (start of itinerary 2)
UA 7146 LAX-OAK 8:05pm - 9:24pm

I know I'll get to OAK, but will my luggage?