Feeling so down

I have a 4 month old son that I love more than my own life and an incredible husband. I try to remind myself of this daily. Lately I've been so down. I had a pregnancy scare...with a 4 month old I was so afraid to be pregnant again so soon. I have yet to have a period even though I haven't been exclusively breastfeeding for months and took a pregnancy test that turned out to look positive but I didn't look at it within the time frame because I was in a hurry to leave the house not thinking after time it was invalid. Since then, I've bought 7 or 8 cheap tests that all come out negative. I thought another baby would be terrifying so soon but instead now I'm horribly depressed and all I can think about is having another life inside of me. All I want to do is take pregnancy test after pregnancy test to see a positive. We know that realistically we can't try for another baby yet. It's too soon and financially probably not the smartest decision but I can't shake this longing I have. Even though my husband and son are incredible, I find myself crying and feeling so desperate for another baby. I had an ectopic pregnancy a year and a half ago and one of my ovaries had to be removed. My dr told me as a result I may have only a few eggs left. She said there is limited research about it really but one ovary may hold more eggs than the other and the one that was removed could have been the main carrier meaning my time could be limited in having more babies. I'm only 24 years old but I feel like I'm stuck. I don't know what to do to be happy again. Has anyone else had a similar experience?