Am i being too hopeful about getting pregnant?

Ok, my husband and I have been TTC for a while now. I was due for my period this past weekend, but hasn't come yet. But I have been feeling slight cramping in my stomach, and something almost feels like it's pushing down on my pelvic floor. Also, lots of headaches and nausea. I don't want to be too hopeful, because I have missed a period and had headaches and nausea before because of stress. But for anyone who is or has been pregnant, have they felt twinges in the lower abdomen, and the pressure on the pelvic floor?? Thanks so much!!