2 months no period

My last Menstrual was Dec 25th. My husband N I are trying to conceive. I missed my period. 2 Negative urine tests. A week ago I went to the doctor for a blood work. Urine test positive but blood work negative. Could I be pregnant. I'm taking prenatal just in case. My stomach is hard. I been tired lately. Vomitting and nausea too. Help please!