i am 19 and am on the pill (tryphasyl) but do sometimes accidentally skip it. i usually get my period for 5-6 days, but the last 1 was only 2 days, light, and did not even last he full 2 days. my boyfriend and i have been having protected sex (condom), but about 3 weeks ago, it slipped. i feel nauseas in the morning and evenings, got extreme abdominal pains, and got this headache which comes and goes. could i be pregnant? how long does it normally take for symptoms to show, and how long before i can take a pregnancy test?