I was supposed to recieve my depo shot in the first week of august but i didnt. I got small bleeding on the 2nd of august and i was suposed to get my periodon th 29th but still have not recieved it. The past two weeks i have had very tender chest and nausea, i took a home pregnancy test last week, it was negative but i was told i might have taken the test too close to conception. Now i have back aches and cramps in my lower stomach, i vomited yesterday morning and keep heaving. I find it very hard to eat also... I really need to know if i could be pregnant, I'm 19 and find it very hatd to speak to my GP. I really need your advise...