Feeling blue

We have had 2 chemical pregnancies in 2 months. My period is suppose to start Friday. I took a test this morning and it was negative. I dont want to get my Hope's up and then have them crushed. But lately I have been feeling extremely tired even after doing nothing. I have some cramps now and what feels like the period poops. But nothing happened. I feel like my cycles are all messed up. The first month I was a day late last month started two days early. I just dont know what to believe with my body. I wish pregnacy symptoms were different from period symptoms. I just really want to have a baby. I'm feeling defeated.