### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello, my period is close to two weeks late. I got off Bcps in may and have been getting my period every 37-40 days without being late. My husband and I are ttc and have tried on 9/12. I was due for my pd 9/17 still havent gotten it. I believe i ovulated on 9/3 but incould be wrong, i was tracking cervical mucus.  I took afew hpts theyre all negative. I feel some symptoms such as cramping, nausea, bloating, acne and occasional constipation. I really want to be pregnant, any possibility I still might be even with the negative home results?  Im going for labs on Monday 10/8 either way, Im just anxious

### output:

Hi, Thanks for the query. I understand your concern.  Your cycle is 37 to 40 days. I would like to furnish you few tips for detection of ovulation also about the days with the highest possibility of conception.  Ovulation detection.  -you are using cervical mucus test. But it can be little confusing to detect its quality your self. So- 1. I would advise you to have USG ovulation study before planning for pregnancy.  2. Ovulation is 14 days prior to the date of next period. Your ovulation would be on 23rd day or 25th day of your periods .....test the cervical mucus 2 days prior to it (From 21st day of your periods till 25th day - You can use L.H. surge test to avoid confusion in observation of mucus.  3. When ovulation is predicted . Have unprotected sex from (5-6 days from the +ve L.H.surge test).  4. Consult a gynecologist be under her care throughout the process.