Period last only half a day...when usually it's 2-3

So this month I got my period on the 10th...I am regular on my period every month... Day 1 &2 before I spotted which is normal for me....But on the 10th I got my period in the morning, I took a bath in the afternoon because my back was hurting, when I took a shower and was washing downtown I had 2 big blood clots....and stopped bleeding the remainder of the day, just had a little brown spotting on Sunday.....Can I be pregnant???