I feel like giving up

Ugh! So I already have 2 kids my son will be 3 and my daughter will be 2 this month after I had my daughter I got the implanon implant in my arm well my husband and I decided in November that we would like to try for a baby he has a 11 yr old from his previous relationship . So anyways I went on December 15 and got my implanon taken out I got my first period on the 20th of December it ended the 27th normal for me so we started trying well suprise I missed my period for January I was so EXCITED so I took a test it came back negative so now in February and 4-5 test came back negative and still no period ugh this is my first time trying to convince my last to were surprise baby's I just feel so stressed and so much pressure bc we both would like a child together it's a lot more work than I thought it would be 😯