Trying to concieve


we currently have a 9 year old daughter now. we have been trying to concieve for the last 3 weeks or so. I was lucky enough to get pregnant right away with our daughter. I feel like I'm pregnant now and have taken a few pregnancy tests and they are still coming back negative. I'm nauseaus not like a cold sick, my lower back and boobs are killing me. I have irregular periods and stopped birth control about 2 months ago and never spotted. I just don't feel right, I really feel like I'm pregnant. I haven't had any spotting and haven't had my period either. Has anybody felt this way or am I just making my brain think I'm pregnant?!?! help