Am I pregnant? Late period?

Hi guys, please help.
My last period was around 5/22, and it's late for more than 2 weeks. My period doesn't come regularly every month. It's usually a few days to a week late.
I had protected sex, but one time the condom fell off in the middle of it. My bf was very sure that he didn't come.
I did 2 pregnancy tests (one at home, one at the hospital) a week after my period was late.
I also did an ultrasound at the hospital, and the doctor found out that I have pelvic effusion.

So, am I pregnant ??
Please help, thank you.