Anyone else have problems with these tests?

Ok so this last month I really thought I was pregnant. I’ve been trying for months with no luck. I have two children. I honestly feel pregnant like I did in the first trimester with both of them. But after countless negative tests before my period I kind of gave up. Last week I had a very abnormal period. It was way lighter then usual and shorter by 3 days. Also I didn’t cramp badly like I normally do before my period starts. On a whim I took two Walmart cheapie tests just to see if I was crazy or not about 2 days after my “period” I got lines within the time frame that are very clearly there but faint. Today I took to first response tests and they look negative to me but in person on one I can see a very very faint line. What do you guys think? Have any of you had This problem where tests are very faint but you are in fact pregnant? I feel like I ovulated very late maybe? Should I try and get a blood test? Help me! I’ve taken the Walmart tests before and they were clearly negative. I’ve heard stories of negative urine tests and the person has a light period and finds out a month later that they were pregnant all along. I feel like I’m going crazy though lol. I swear the symptoms are pregnancy symptoms that I have (bloated, emotional, nauseated, light cramping now, swollen boobs)