14 days late

Jennifer

So my husband I have been trying for 6.5 months now. My cycle was suppose to start April 8. We are now 14 days without it in sight. I had blood work done Thursday with it being a 1.0. Obviously negative. The mornings I feel sick. Throughout the day I have unbearable cramps off and on and lower back pain. My doctor wants to send me for a trans vaginal ultrasound if I don’t get my period next week. Any ideas of what’s going on?