Could I be preggy?

MY hubby and I misscarried october 15 2006 and were told to wait a cycle before trying again. On November 18 and 19th we tried for another baby (we have one daughter already) and on the 21st i got my period, lasting four days. Last night (november 29, 2006) i started to get nausious and am having some of the same symptoms as i did with my daughter but we only had sex ont he 18 and 19, not since then. Has anyone gotten preggy so close to the start of their period or does anyone know if it’s possible? I had about two periods with my daughter. Thanks.