Hi. I had unprotected sex on June 27th.
On July 1st, I started bleeding. I assumed this
Was my period. First of all, my periods are
Extremely accurate and I have never been
Late, except for this time. I only bled one day,
And after that it was brown for a couple days,
Then it stopped. I am cramping bad and I have
Felt very dizzy. I have tender nipples and
Other signs of pregnancy. Could I have had
Implantation bleeding? Could I be pregnant?

There is always a first time to be late. EVERY woman is late from time to time. What varies is how often.

Second.. those aren't pregnancy symptoms... there is no such thing... same with implantation bleeding...

Why would a single microscopic cell cause bleeding? Give that some thought.

You can't and won't know until you are at least two weeks late... then you can take a test... if you do it sooner you won't get reliable results... meaning a negative taken early might not be a negative.

You also MUST do it first thing after you wake up... the first time you pee... or you have to wait until the next day.