well my DH got back from serving for 7 months in iraq 15 days ago and we've been havin regular sex almost every day since

. Although i belived i'd allready ovulated b4 he came home as i noticed my cm had changed, but over the last couple of days i've used the opk and it came up with a positive line, so we've been ttc. But then yesterday i had a very faint pink stain in my underwear followed by the same today and a little bit off blood plus period type feelings. This isn't normally what happens when AF arrives its normally all or nothing, and i'll always have tender breasts but not yet this time. I'm confused and inpatiant!! why would the opk show a positive line ( i did lots of them) if i am either pregnant or my period is due? i'm hopeing this is IB and not a period as we've been talkin about it and tryin for on and off for almost 1 year. i'm so irregular that its almost imposible to time when to have sex. i know the best way is just too relax and let it happen naturally, but its soo hard when your as irregular as me! ( between 29-59 days). what do you guys think?