Dani--

Western Bypass (as recommended by Bobert):
I-95 N to Fredericksburg
US 17 North to Warrenton and beyond
US 15 North to Leesburg (use bypass around Leesburg; expect traffic here)
US 15 North to Frederick
I-70 East to Baltimore
I 695 North and then East past Towson to I-95
I-95 North to Havre de Grace

Eastern Bypass:
I-95 North to Bowling Green, VA
VA 207 North/East to Bowling Green
US 301 North through Waldorf/La Plata to US 50
If you don't make any turns at US 50, US 301 North runs into MD 3 North
MD 3 North to I-97 North
I-97 North toward Baltimore
I-895 North through the Baltimore Harbor Tunnel to I-95
I-95 North to Havre de Grace

Or coming up through the center:
I-95 to the I-495 Beltway
At I-495, you can go EITHER WAY around DC--it's equidistant
Listen to WTOP (1500 AM) which has traffic every 10 minutes.
If they mention problems on the outer loop at the Wilson Bridge or Prince George's County---that's I-495 East/I-95 North they're talking about
If they mention problems on the inner loop at the American Legion Bridge (or Tyson's Corner, I-270, Bethesda), that's I-495 West they're talking about.

You pays your money; you takes your chances.
Good luck.
See you tomorrow, g-d willing and the traffic volume don't rise.