Scared to test

We had a miscarriage last November and have been trying to conceive for 6 months since! We conceived the 2nd month of trying last time and the only thing that had changed was I had gained weight (comfort eating). I vowed to make a change last month and lost 9 pounds over 5 weeks! I used the clear blue advanced ovulation kit and it said I ovulated 2nd July. My 2nd half of cycle is usually only 12 days long making me 4 days late! I have had a few cramps but that’s it and no sign of a period! Has anyone used the ovulation kits, got a positive and their period didn’t come when it should have? I just can’t face another negative pregnancy test! I working away from home this week so will test on Sunday with my husband if no period!