Advice needed! Thank you!

I missed my period this month! I was suppose to have it between 14-20 time frame but it didn't happen, I've had it come in 20-27 so I waited and there's still nothing.. It'd start around 20 but there's nothing.. I took a pregnancy 2 days ago and both says positive.. This month I've also had a lot of discharge that were more than the regular and they were thick instead of just clear. My breasts have been achy and very sensitive and I'm having weird side pains on my stomach. What's happening? Should I be worried? Thanks ladies!