Pregnancy symptoms

I'm an extreme noob on this page and I have no clue what the abbreviations are just yet. My husband and I are trying. This would be my second but my first one is almost 15 years old and I've been pretty much in pills since she was born. I stopped my pill and had my first period from April 11th-16th. I've always had quite an irregular period and bad PMS but this time it just feels really heightened. My breasts feel so much fuller and feels really sore. Always feeling nauseous and quite tired. Had such a massive headache on Sunday. Started urinating much more today. Cramps. Low back pain on side that goes on and off. Feeling thirsty like crazy. According to this site I should have my period in 8 days...
My question is, has anybody felt symptoms of pregnancy at such an early stage??
 Thank you!!