Late period, negative results- Could I still be pregnant?

[Ladybughope]

Hello guys!
I am currently going to be 4 days late for my period. Last month, sexual activity happened and took a morning after pill (Plan B) 1 or 2 days after. I had some light spotting but my period came maybe 1 day earlier than expected. This month about 2 or 3 weeks ago, sexual activity then happened. We did not use protection that time neither the time before. I noticed my period missed its projected date and decided to take a HPT. It was negative. But here I am extremely tired and sore. My hips and my abdominal area are as if I did a billon sit ups. Aswell as light cramping and my breasts are very sore but no changes I've seen with them. I felt some light nausea here and there but nothing to serious. I am planning to test again Monday. What do you guys think it is? Thanks!

[Ladybughope]

Thank you! :) I will do that!! :)

[unnone112400]

Test again Monday let's go from there