Is there something wrong?

Hi, I’m 26 and iv had 3 pregnancies. 1 was a still birth but the other 2 was successful. My boys are now 5 nearly 6 and 8 years old. I had no trouble getting pregnant before the depo.. maybe a month or so I’d be pregnant from trying to conceive. I was on the depo injection after my youngest for about 4-5 years. Iv now not been on the depo for about 6 months. Iv been trying to get pregnant and had no luck. I’m panicking because I feel like there might be something wrong with me. I had some bleeding 29/1/18 and lasted about 3 days. Then the next bleed I had was 12/2/18 for about 3 days... is this my periods that have come back?? I don’t even know anymore as it’s been so long that iv not bled for. Iv done ovulation tests and sometimes there’s been a positive dark line.. i have sex quite a lot and still nothing. Am I just being silly? And just need to give it some more time?

Thank you for your help

Claire x