so excited- please help

Lauren
I had a MC on April 18. I was 5.5 weeks pregnant. 
I waited 6 weeks for my period and since then my husband and I have been TTC. 
We had sex one day before I ovulated. That was 2.5 weeks ago. My period is due THIS Friday!! I took 3 tests this week. All negative. 
For the past week and a half or so I've been experiencing symptoms... persistent headaches, DAYS of dull cramping in lower abdomen, extreme irritability & today my nipples are both extremely sore/cracking (gross I know) and I just noticed a huge apparent vein in my left breast. 
Have any of you ladies experienced these symptoms? 
I'm freaking out because I am taking the Bar exam in exactly one month (graduated from law school last month). A pregnancy was not something I planned for (I didn't actually think this would happen) BUT I am overjoyed at the thought of it. Maybe it'll help me calm TF down! Lol. 
Please help! Thanks everyone :)