is there a possibility I'm pregnant

Okay so me and my SO had sex the 28th and it was unprotected. When changing positions I saw cum when he pulled out but I thought it was me bc it was more white then his is plus when we got done he came and it was lighter. I don't always know when I come...but yesterday the 9th my period was supposed to come on but ever since last week I get white discharge like literally everyday. I thought I was fine but now today I'm still not on my period and every time I think I am I'm just really wet for some reason and when I wipe I just get a little whiteish clearish discharge and one of my boobs grew big quick just this week tmi and my back hurts a lot and I've been bloated like crazy what's going on someone please help me I'm starting to freak out. Any other ideas...sorry if I don't reply I'm great full for all advice thanks in advance ladies