Need advise!!! 😔

Katie
Last month I thought I was late for my period, so I did a test and got a positive result, as you could imagine, me and my boyfriend were over the moon and so excited, only to do a test the next morning to find it was negative.. Every test I've done since has been negative. We've been having unprotected sex for at least 2/3 months now.. Every day, sometimes 3/4 times a day! I had a period (not too sure if it actually was a period or not) last week, I've been having headaches, hot flushes, tingly boobs, craving certain foods, my sex drive is very high, I'm always constantly tired. We had a little boy about 5 nearly 6 months ago now and we started trying so close together because after 4 years and three miscarriages we conceived our little boy and we were told that after birth, girls are extremely fertile and it's so easy to get pregnant again! I'm convinced somethings not quite right but every test I've done has been negative! Can anyone help?! 😔Â