Is it normal

So late evening yesterday I took an ovulation test at 8:34 pm and if was a positive right off the bat. Me and my husband baby danced. However, I took 3 more ovulation test today and was wondering if it is totally normal to get a negative result after I got a positive result. The last 3 test are from today and there all negative. When will I ovulate. I'm going to baby dance tonight again. Also, I used preseed last night. Did that seem to help anyone else that was ttc and succeeded?