im having pregnant like symptoms and menstruating symptoms

i think i may be pregnant. i dont have a stable menstrual cycle. it changes over periods of times. but it mostly 28 days. ive had seen my period feb 26 and had unprotected sex on the 21 of march. my period came again on the 25th of march but did not last long and was lighter and less cramping than usual. ive noticed that ive been feeling nauseous sometimes within the month after my unusual period. this happens mostly after meals. sometimes i feel so hungry that i would eat a "cow" and at other times i can barely go 2 spoon fulls without having the urge to vomit. but i never did in any instance. at one point i noticed i had a very severe headache. that didnt last for long. so i didnt consider pregancy in both instances  since i saw my period (which was very light). its coming near to my menstruation time and im having regular menstrual  symptoms. tenderness in breast, craving, frequent urinating, fatigue. but ive not have any cramps surprisingly or any abdominal pains. however ive had an addition to my symptoms, ive noticed that in the morning times when i wake up i feel more nauseated than ever and i would spit for a million times i also have increased urge to vomit but i never did. this started two days after i should have had my period which didnt came. this was suppose to come on the 22 of april started feeling morning sickness symptoms on the 24. on the 25 it worsened and continue through the day and in the night. i still havent seen my period. today the 26th i decided to take a pregnancy test. but wen i woke up i noticed a little bit of blood. note my period should have came on monday but instead is 5 days late and less painful. i still have the morning sickness symptoms. could i be pregnant though im experiencing blood like im menstruating or must i go ahead ad take the test or visit my doctor?