Help please

Okay so the husband and I have been trying for baby number 3. We had sex 5 times last month. This month I am 15 days late. My period was suppose to start on the 3rd but didn't. I have irregular periods but I usually have a period in a month. Usually around the day it says or a couple of days after. I have taken a test at like 10 am in the morning it was not the 1st morning urine. Any way's sorry tmi but it came out negative. I don't have a stressful job and I wasn't in any kind of stress. I'm thinking maybe it was to early to test but then idk. Help please. Thanks in advance