Pregnancy, trying to conceive.

I had a period on March 6th, had unprotected sex, followed by ejaculation, on March 17th and 21st. I then had bleeding on March 30th through April 4th (light). I then started bleeding yesterday, April 28th, and I've only used one pad. Could I be pregnant? If so how far along? I've also had unprotected sex numerous times after the dates listed.
I have had pregnancy symptoms such as:
-nausea
-dizziness
-cramping (some days mild, others are worse)
-I went to my OB-GYN and she did a sonogram due to an ovarian cyst, but when she looked it was gone and informed me I had a thick uterus lining. She said it could be due to my period about to begin. I didn't inform her I was trying to conceive; this was done about a week ago.
-heartburn/some reflux
-nipples seem to be getting darker around the outer area & there's a darker ring around the actual nipple?
-boobs are sore, but barely; not like a period where they hurt days before.
-lower abdomen seems bloated.
-i feel i'm urinating more.

Please reply, thanks in advance! :-)