Pregnant??

Hey ladies, I have been feeling a little off for a while now. But this last week especially. My boobs are killing me and are swollen and getting bigger (even my hubby said something about them growing). My last period was dec 8th but I have super irregular periods so not sure when my next one is due. 😩 I had some symptoms of ovulation around Jan 7-8. I don’t track anything and we are not trying, but also not preventing at all. I decided to test this Am with the Walmart 88c test and got a super faint line after about 6-7 min. But then took a digital right after and got “not pregnant”. Advice??