Are these signs of pregnancy or miscarriage?

[Questionable274]

I am on camrese birth control, but had unprotected sex 2 or three times while taking antibiotics because I wasn't thinking about the fact that it can mess up my birth control. My period was two weeks late so I took a pregnancy test that came back negative just in case. My period started a week later so I thought everything was fine. But it was very light and only lasted 2 days as opposed to the 5-7 It usually lasts. Ever since then for a little over a month now I've been randomly bleeding for a day or two. I've been having nausea, headaches, stomach cramps, the smell or taste of certain things that I usually like are making me sick to my stomach, and I've been exhausted. Is this normal? I googled it of course but there are so many different possibilities it says it could be. Any ideas on what may be happening is a big help.

[Questionable274]

Also when I do bleed it is dark blood cots