Any advice

My period was due on the 20th I don't want to test yet because with my other two pregnancies I couldn't find out until I was about 7 weeks lol. My cycles are 28 days and I can usually tell when my periods going to start but, it still hasn't came. The only things I've really noticed it some back pain, little niggly pains in my pelvis area it feels like pokes. I've felt more tired the past few days we have a 1 year old and he has me up every day at half 7 it's usually easy to get up but I've been finding it really hard the past few days, a few times I've felt a bit nausaus. Apart from that I haven't really noticed anything that makes me think I'm pregnant, the only other thing I can think of is my cm, I've had loads of milky cm I can feel it coming out, but yesterday and today after wiping I noticed clear stretchy cm and also slightly yellow tinged? I have no infection I was checked.