Period/pregnancy questions

I made a post about this almost a week ago but my period is almost a week and a half late. I know periods are different and they can change and everything but mine has never been this late before. Me and my significant other have been trying for the past couple months qnd I usually take a test a couple days before I expect my period. They all come out negative but the women in my family have all had their period while pregnant in the first few months. We've been trying to conceive since August and still nothing (according to the pregnancy tests). Im almost a week and a half late now. I haven't been stressed or doing anything to affect my period. But the tests I've taken are still negative. I took one yesterday morning and it was negative. I've been feeling really nauseated and dry heaving the last few weeks, almost a month, I've been urinating a lot and my lower stomach feels tight..Like a stretching sensation, I'm scared of doctors (its a fear of mine) but at this point I feel like I should go to one. Does anyone on here have advice?