You can buy a pregnancy test to use at home from a supermarket or pharmacy. Try Walmart, it's not expensive. You should use protection.
I just had my period 6 days ago .. I started spotting today and I feel as if I'm gonna start my period again. That's never happened to me before. I had unprotected sex with my boyfriend before, during and after my period, could I be pregnant?
You can get pregnant on your period
Yes it's unlikely, but you can get pregnant when you're on your period, and just before, and just after. So you should use protection at every stage in your cycle.
Spotting after unprotected sex can indicate pregnancy
The spotting that you're describing could be implantation bleeding, which happens a few days after the egg is fertilized by the sperm. Fertilization can happen up to 7 days after unprotected sex. This is another reason why you should see your doctor or buy a home pregnancy test.
Spotting after sex can indicate other things
If you've just had your period and now you are spotting, you could have an infection such as thrush or an STI. You may want to have a look at this question I just answered on bleeding after sex: //relationships.blurtit.com/4167396/i-had-my-period-already-this-month-like-a-week-ago-and-i-had-sex-with-my-boyfriend-and
There I explain how spotting can be infection, injury or cervical problems. It may help you to figure out why you are spotting after you had your period 6 days ago.
You might find this video on bleeding in between periods helpful:
I want to stress though, any abnormal bleeding that is worrying you should be reported to a doctor. Good luck!