Does Headache, Missed Period And Stomach Cramping Indicate Pregnancy?

Hi I haven't had a period since April 21st and I e been hungrier alot lately having headaches cramping in my stomach and my back hurts from time to time. Also my face especially my nose has been super oily and I've been alot tired lately. My mouth has been really dry and today I experienced really bag back aches stomach cramps and light brown spotting. Am I pregnant or what else could n wrong wit me bcuz me and my partner have been tryn to conceive