Tested Positive Today! Have had rough symptoms extremely early?

I went to the hospital 2 weeks ago due to horrible abdominal pain, extreme clear discharge, headaches and nausea. I have PCOS. I also have 16 month old twin girls. My ovulation cycle the past couple months have been horribly painful. During this time I was ovlating and had sex a couple days prior. While in the ER they tested me and it was negative. For the past couple months due to my weird symptoms I test frequently and had tested before I went and I knew it was negative.

Fast forward two weeks and I've taken a couple more tests that have all came out negative. I've still been dealing with horrible neausea everyday. Well I bought three more tests from Dollar tree yesterday, took them today and they all came positive. I went and got a digital one and it came back positive as well. I'm really excited as I've been wanting to have another baby, I'm just nervous that I've had such horrible symptoms and I would only be like 4 weeks pregnant if I go by my last period date. Anyone else have symptoms so early or go through any of this?