How soon can u feel morning sickness?

hello everyone my husband and I are ttc are 1st im in the two week waiting period,but for the last two nights i feel like i want to throw up when i smell food or right after i get done eating, is this or could this be a sign of pregnacy.but ive also had a bad headach/sinus preasure but how early can someone feel morning sickness and does anyone think i have a good chance of doing the bd I shouldnt test till probley next thursday grrr i hate waiting lol thanks to all who relply and may GOD spread the baby dust around for us all...............Good Luck and God Bless everyone