Helppp

My last period started 12/13/2018 I ovulated around 12/28 - 01/3. I had sex in Between those day. I had cramming then light brown spotting at 01/8- 01/9. I average 37 days but irregular. No af so I tested on the 19th (middle of the day urine) 6 day sooner first response and negative. Then again on the 21st ( urine in the morning) and negative. I did use the restroom again in the 21 at 3 am but I didn’t use that. I’ve been using the bath room, nausea sometimes and eating a lot. No other symptoms. My app said I’m 2 weeks late? Cycle day 49 the latest I’ve been! Should I test again???