Need advice!

Michelle
I have had problems with my periods, like missing periods or having really long heavy periods, since i had my first born 12 years ago! So when i finally got my period on track in October 2016 i was excited because me and my husband are ttc! I have had steady periods every month since October up until this month. I am 10 days late! My previous pregnancies weren't able to be detected by a hpt and the dr never told me why. But i took 2 of them 3 days ago (because every pregnancy is different) and they were both negative. Now that being said i am having symptoms but can't be for sure if they are related too pregnancy or not! How can i be sure ifs I am pregnant or not besides going to the dr? (can't afford)