HEAVY BLEEDING could i still be pregnant?

[Amy1989_27]

PLEASE HELP.
I had unprotected sex on april 29 & 30. I had spotting on May 3.

I also had 2 days mild bleeding/spotting on May 15 & 16 and starting to have same symptoms of pregnancy and frequently urinating.
I'm expecting my period to come on May 18 however it did not come until on May 23 i had mild bleeding (pinkish to brownish blood) same on the next day May 24.
On May 25, yesterday i was starting to have heavy bleeding just like a normal period up to now.

I've never experience this in my entire menstrual cycle.
I' hoping that im pregnant. Cause i was and i am experiencing the symptoms of pregnancy. I did not use any pregnancy test yet. I'm scared cause it might be negative. For it is too soon to have one.
WHAT COULD THIS BE? PLEASE HELP. Does anyone experience this?
I am 27 yrs old and hoping to be pregnant.