Concerned

So I'm 2 weeks late for my period, I've been working out about 3 days a week for the past few weeks, I've gained 4 pounds since January 30th which brings me up to a total of 12-14 pounds since getting married in November, I don't eat like crap a lot of times-we all cheat here and there!-but with my sister having PCOS Im concerned I may have it even though I've never been diagnosed...it's not like me to miss a period as I've been pretty regular for the past two years...I've taken 4 pregnancy tests all resulting in a negative ...I have an appointment with my gun on Monday...advice or thoughts? Thanks all