Chances of pregnancy?

Hey everyone, I was due to get my period last Thursday but I didn't get it. However, I do have breast soreness and cramping that feels like everytime I go to the bathroom in GONNA see my period but I don't have it yet. These are symptoms that I get during PMS usually a week before my period starts. I've had sex 4 times this month twice being yesterday and I used protection and my boyfriend even checked the condom after all times for any leaks or holes. I feel like this late period can be due to the fact I've been working out much more lately then usual, my eating habits have also changed and I also have lost weight so I feel like this is why my period is late. What do you think are my chances of being pregnant ? Or maybe it's just a late period ?