No, the thing is, if you have your period then you arent pregnant. Please use a condom for the future, a baby is no good if you are young. You need to wait and see if your next period is late and then take a test in the morning, but chances are if it was negative and you got your period you are not pregnant. But when did you last have sex? When did he come in you? Some women spot if they are pregnant ut you never know. Take a test later.

But I was like 3 weeks late and my period was light

So then take another test in the next few days, in the morning to find out. If its still negative then wait until your next period is due. And if its late, then you take one. Good luck. Be safe for now...Condoms or b/c.

Thanxs