Take a pregnancy test. It sounds like implantation bleeding
If you only had light spotting and a bit of cramping and it has all stopped you may be pregnant.
You don't normally get symptoms until 2 weeks after sex at the earliest
Even if your period begins with light spotting, it is still your period.
Yes.
Cramping can happen whenever! I sometimes get cramps 2 weeks before I actually start my period. My worse cramps come the day before and the day of my period.
You were only spotting for not even a full day and having some bad cramping?
Spotting
My best friend and her mother both had their period for the entire pregnancy. Yes you can still have cramping and spotting. I found that during strenuous work or a stressful day, during my pregnancies, that spotting occurred. Also, you could be cramping because the uterus is growing as the baby grows.
That sound like your pregnant I had that same sign take a test
at any point in your life that you are ovulating you can become pregnant
Yes.
Generally, if your spotting that singnals the beginning of your period. Unless you spot a couple days prior to your light flow, consider the spotting your first day.