I have been having nausia, headachs, darkened nipples, lower back pain. I have been waking up in the middle of the night to throw up. My period was late but it was barely there. My breast are heavy. I have been having light cramping. I took a pregnancy test that came up nagative. But could I be pregnant?

It would be sensible to take another test just to be sure, some can be wrong sometimes,go to your doctor they will be able to help

I had sex while on my period can I be pregnant it has only been 2 days since I strated my period

I am 17 an had a endo bisopsey like a hour ago I am in sooo much pain n my pelvic an my lower back it feels like I am going to throw up an I'm dizzy to is this normal please help thanks

If you can't wait it out go to the ER or an urgent care clinic. A biopsy shouldn't be this painful, when getting this the person doing the biopsy should have given you some background information, i.e. what to expect and when you should be worried.