Hi Doctor. I Am 26. I Am Married For 3

Hi Doctor. I am 26. I am married for 3 years and weigh 58 kgs. My history includes one abortion 2 years back due to exposure to X-rays unknowingly. My last menstrual cycle started on 17th November. My cycle is around 30 days long. Did urine test for pregnancy on 28th December. It was negative. Doctor gave me deviry tablets for 4 days. Still no sign of periods. I feel nausea, vomiting sensations in morning, fatigue. Is there any chances that I can be pregnant?