need help.

Krystin • Living my best life. ❤️
I post on here a lot but I just have some questions. With my first son I didn't find out I was pregnant till almost 8 weeks even after hpts came out negative. I went to the hospital with what I thought was the flu. Well I was pregnant and 7.5 weeks along. Now I'm trying for baby number two my son is four and this was our 7 month trying. I've took 3 test and only one came back positive with a faint line. My last period was dec 8th and I have no sign of her showing. Im tired ALL the time I'm eating everything in sight and I'm so grouchy and everything is getting on my nerves. I know my hcg levels are low but has anyone experienced this? Has anyone else had low hcg levels and got a faint positive then neg but have pregnancy symptoms and still be pregnant?