Could I be pregnant?

I just started TTC last month. I stopped taking BC on August 19th and had my period right after that. I am now 4 days “late” for my period but i dont know if my hormones are just screwed up (since this is my first full cycle off BC), or if I may be pregnant. My nipples are semi sore, but my whole breasts aren’t, I am cramping periodically and it isn’t super painful and doesn’t last too long. Other than that, I don’t have many symptoms. I’ve been tired and somewhat nauseous but that could be my allergies acting up. I’ve taken 4 hpt between 10 DPO and 2 days past the estimated arrival of AF and they were all negative. Now that I’m 4 days late, should I test yet again?? Or should it have shown up by now and I’m just off because of hormonal imbalances..?