Today before getting into the shower, I peed and when I wiped, there was pink blood on the toilet paper mixed with white and it looked slimey. I thought it was my period stating early but it's been a couple hours and there's nothing showing up on my pad except for one small spot of brown discharge. Every single time I've checked by wiping or sticking a finger inside, there has been no sign of my period except for one time when I wiped a couple hours after my shower. This time though it was bright red. Ever since then, there's once again been no sign of my period. 

Should I be worried that it's something serious or is it possible that my period is off this month? 

It was off last month too. It was a lot heavier than normal. 

My boyfriend and I did have sex around 4 days ago which is why I don't think it's implantation bleeding. We had sex last month too but I had my period last month. But I have been experiencing a majority of the pregnancy symptoms ever since my last period. Any thoughts?