Any body here who is pregnant and bled early on as if it was a period did you get a positive test result straight away?

We had sex whilst I was ovulating many times had all the very early symptoms and then came on early but it was different to my other periods as in colour and flow seemed to be heavier- I took a test but came back negative since I have been nauseous tired backache strong smells needing to wee so much more than normal- and I am not sure what is going on. This would bet second pregnancy. Any advice would be appreciated. Thanks in advance