PLEASE answer: implantation or period?

kammy
Alright so I had sex, he pulled out before, and I'm on the pill, but sometimes I miss it but I'm usually really good about taking it. I started spotting about 3 days before my period (I have spotted before my period before) and it's like a brownish/pink color, but also has dark red like regular period. I have to Change my pad about once a day. I haven't been experiencing nausea or breast soreness and I had cramps on the first two days of it like I usually do with my period. It is only one day past my period and it's still happening, and the bleeding has been for about four days now. It's fairly light, and once I had a period where I spotted for a whole week with cramps and everything before my period and then had my period for another week. My period is often very irregular but I just don't know. What do you guys think? I plan on taking a pregnancy test soon. (I have to add that I've been slightly stressed about it so I know that can delay a period too)