Could I be pregnant?

Lindsey • I am 20 years old and currently on my bachelor`s for child psychology. I am engaged and getting ready for my big wedding. My fiance is 28 and an amazing man. Wanting a child but are having difficulty.
My period started like normal except a little lighter. Not enough to use a tampon really. The next day it was normal once and the rest of the day I was spotting. Now after just spotting all day yesterday I eventually just stopped and I hadn't started back today. I just have this thin, sticky, slippery discharge.