period ? sex?

I had sex well it was strokes and stuff and he pulled out and I gave him a blow job so 100% no cum went inside me because I swollowed it all, and then the pre cum is less likey to have sperm  because he did not ejaculate before having sex with me.
So from that I've been stressing a lot because I do that with everything in life sadly. 
I had sex about a month ago 
I am expecting my period its kind of mix in with my discharge and it's looking like not a full load it kinda weird like it looks like it wants to come out but it's not at that point 
Please help I do not want to stress and delay it
I Googled stuff and some implantation bleeding came up .. but that usually comes in 7 days from sex I heard and it's been a month since I had the sex.And only 33% of woman get it 
So pleas ease my mind 
O god please