could I be pregnant?

Hi I'm new to the glow app. My last period was from (3/15-3/20) very unusual since my periods are usually 4 days long. I also had unprotected sex with my SO on my first day of ovulation (3/27). The week of my period I usually get bloated and start having backaches and cramps but I didn't experience cramping until the day of my expected period (4/15). I waited two weeks to do a PT and I had two BFN. When I looked back at the second test (with morning urine) I think I see a vvvfl on it but I'm not 100% sure(PT in the light). I took a test yesterday in the afternoon and when I looked back it about 10-15 minutes later I think I see a vvvfl in that one too but thicker in width(PT on the yellow background)   took another one this morning and another BFN but my period is now 21 days lat and I'm experiencing sore boobs nausea and cramps like I'm on my period but nothing. I'm sorry it's so long but I need answers