Crazy or True Possibility?

Kayla
So my husband and I were not trying for #3 at all. We use condoms but I am not on any birth control and haven't been for years. 
My last period was December 23-28. My cycles are always 30 days, a few times 29 days. I normally have 6 day periods but I am always regular, never late. I've been late 2 times in my life and that's when I was pregnant. 
Anyways, on the night of January 8th, hubby and I had sex and I actually asked him if he was wearing a condom and he said "duh" but it just didn't feel like normal, but he was wearing one so I didn't think anything of it. Almost 2 weeks ago I started feeling just kinda blugh and thought my period must be starting so I looked on my app and it wasn't due for 4 days BUT I noticed that the 8th was my ovulation day according to the app. 
Long story short, I am 6 days late, on Cycle Day 37. I took a test one day before my period, the day after my period was due, 2 days after, 3 days after, and then one this morning at 6 days after. All negative. 
My only symptoms are have to go #2 more often, slight change in sensitivity if my boobs but not much no hurting, gassy, and night sweats the past 2 nights. That's it. 
Am I crazy or could I still be pregnant? I'm not stressed, I would honestly be very very excited and so will hubby if I am but I hate not knowing. Any advice? Sorry for the novel.