Its something you have to figure out yourself unfortunetly and you should do it everyday. I started by everyday placing a finger inside you until you feel your cervix if its low it will be easy to reach but if its high it will be harder to reach. Its best to feel it in the same position either sitting on the toilet or laying in bed. I found its best to lay in bed as you are more comfortable. You will notice there is a small opening to your cervix and at different times in your cycle it will feel low closed and hard and then high open and soft. When its high open and soft thats when you are approaching ovulation. All I could say is you will learn alot about your female parts doing this and this also is how you could check your cervical mucus.
I don't even know how to check my cervix, what is it that I am feeling for? How do you know your's is low...
The cervix changes positions and firmness throughout your cycle. Usually it is low and soft when af is about to visit. If it is lower than most normally, I would think it would increase odds.