What could be going on?

Hi ladies, my boyfriend and I have unprotected sex always but he does pull out, and I know that you can still get pregnant from pre-cum, but I always have thought the chances are extremely low. So, my period is always regular, it has never been off, and it was suppose to come on the 25th of this month, and it still has not come. Now I have had some super mild cramping, but if this makes sense, it honestly does not feel like the period cramping(I hope that makes sense). Usually before my period, I feel bloated and some cramping and what not. But that mild cramping, literally comes and goes. I've also been having runny bowls for 2 days... & I have also noticed myself being more exhausted than normal. I mean I get to work at 8:30am and by 9:25am I'm yawning all the way until I'm off at 5:00. When I get home, I'm going to bed by 9 or 10. Usually I can always stay up. But other than that this is all I have been feeling lately. I will also mention, I have been going to the bathroom more often, but it doesn't feel like "omg I need to go , if I don't I'll explode" but it definitely is more often that I have to go... I'm just a little curious what you all think could be going on, or why my period is so late? Or what!! I'm just confused!!!