Pregnancy after miscarriage

To give you a little history... I miscarried on April 9th being 5 weeks pregnant. I had a chemical pregnancy. I have not had a period since then. On day 21-28 I had very light brown spotting with 1 episode of red spotting. I took a pregnancy test yesterday morning being Mon the 17th of May. It was negative. I feel tired sometimes, frequent urination, occasional breast pains. I have 3 beautiful boys at home and this is my first miscarriage. I am not sure what to expect. Should I have a normal period after a miscarriage? Or should I count the 7 days of spotting 3 weeks after miscarriage as my period. My cycle is 31 days long. I feel like I am loosing my mind. I feel like I am making up my symptoms because I want to have a baby. Also I would like to know if I am pregnant, I am leaving for vacation in 1 week. What should I do?