Could this be early sign of pregnancy? Please help

Hi ladies my husband and l have been trying for a baby its beena year+ now so my lately l have been feeling tired, nauseous, slow when I'm walking also l don't like the smell eggs so l don't eat them but apparently I've been craving eggs to a point of frying more than once a day. I've been feeling thirsty too much also hungry even after l finish eating, sore nipples, l feel like I've gained weight. According to Ovia my period is due on the 21st this month but today l started feeling severe backpain and lower abdominal pain which was strange to me because even on my cycle l don't feel period pain. I noticed blood when l wiped in the washroom . I'm so confused l don't know if its my period or something related to pregnancy