Missed period waking up to a lower stomach pain

Hi my name is Amaya My period usually starts around the 25 and it's now the 30th I have recently had sex and didn't think about pre-cum and we thought I was pregnet but then the symptoms went away and then this morning I woke up from my lower stomach hurting and I tried to use the restroom to see if it would make the pain go away but I didn't after a while and with m missed period I have been having a lot going on my grandpa died recently and been having dad trouble and this on top of it we think I missed it cause of stress but I don't even know anymore I just need help please help me