types of cm/cervix help

can you tell me all the different types of cm and when they occur. I know what's normal for me but what I'm experiencing now isn't normal. so idk what's going on. I have been experiencing cramps and creamy wipe discharge on and off for a week or so. the cramps since before my last period which started the 9th of December. I was cramping for a week or so before that. and am still cramping on and off. I took a test a few days ago and it was negative. I am scared because with my son I didn't test positive till a little over 2 months. I have the skyla iud and I have found any forums and whatnot about people getting pregnant with them. so again I'm worried. I don't have the money right now to go see my Dr so I'm lost. my cervix is now high and hard. a few days ago it was still high just soft.