Pregnancy

Me and my sos have been trying to get pregnant. I was just wondering if there might be some tips y'all would suggest 
I was 15 days late 
We were both positive that I was pregnant. I was throwing up. Being late. Having extremely sore breasts. 
I have been puking for 3 weeks. 
Yesterday I started my period and was devastated. I also took 3 pregnancy tests and they showed negitive. 
Any suggestions ? TIA