Im so confused! My period was due on the 21st. HPT's are negative. Im never late. On the 16th my partner ejaculated inside of me, 16th is past my ovulation date. Is it still possible I'm pregnant? Too early for urine to pick up?

You're only 5 days late, so yes, it could be too early to test.

Wait another week, or 2, and if you still haven't gotten your period, try testing again. Make sure to use first morning urine as it's more accurate.

Some women never get a positive result on a home pregnancy test, even though they are pregnant. For more accurate testing, see your doctor for a blood test. :)