18 days late but negative tests

Mercedes
Has anyone else experienced this?? I haven't taken a test since Sunday! I don't want to take another one until this Sunday, I will be 3 weeks/21 days late exactly. I usually start my period a day or so later then I did the last month. So I had my period March 29-31. So I should have started may 1st ish. No period in sight! 
I have some random symptoms but I don't know if they could even be called symptoms. 
I am not sleeping well at night (I normally sleep great)
My skin has been horrible! I've been breaking out like crazy. 
ALL I want to eat are wild berry pop tarts and Philicheesesteaks. I liked those things before but not so much that I wanted them every single day. 😂
This next one is really odd but bare with me. My cat has been up my ass lately. He normally loves on my husband and mostly just tolerates me. But lately he's been laying all over me, following me around, laying on my lap. Etc. 
I've also been a little edgy lately. On top of that I have this never ending "feeling" that I am pregnant, I just need to be patient. 
I don't want to trick myself into thinking I'm pregnant if I'm not. It's so hard to not get my hopes up! Im not looking for a definite answer on here, I just want to know if anyone else has experienced this?? And what the end result was! 
Edit: also I should mention I have 2 kids already, but my husband and I can't for the life of us remember what it was like super early in pregnancy. I didn't get a positive test until I was 16 weeks with my oldest! He's 5 and my youngest is almost 4. I hate that I seem to not get positive results until I'm over 10 weeks. Hoping this isn't the same if I am!