So my last period was March 25-29 I ovulated April 8th which I had sex on according to this app also I'm never late and I'm always either a day early or right one time. I'm now four days late and I'm on 17dpo I tested yesterday which was 16dpo while at work yesterday it was negative should I continue to test or give up ?? My symptoms are sore boobs, legs cramps/aches not much of a appetite, insomnia and fatigue, low back pain and cramps on and off but still no af I'm not stressed or nothing has changed in my life. Should I test again ???