Need help !! Please any mom there have experience about pregnancy!!

My last period is mar 24. After done with periods i wait to my ovulation day i have so many sex that week and week after to make sure we have a baby. Cause we been try for 3 month. Then on Friday mar 20 I thought i have period early but not just pink bleeding off and on to next day stop. I thought maybe i have lucky this month i may pregnant. I wait until on 24 this month after i miss my period i test it is negative. And then 27 i text again still negative. I am so disappointed my husband think i be too stress that my no period. My breast are tender after i eat something i feel nausea. Low back age.i pee a lot too and heart burn. I dont know how much i pay for pregnancy test already. I ask my sister she say she didn’t have any implantation bleeding or any thing. My husband tell me think too much. That why feel like pregnancy.but i know i feel it. But now after test this morning i kind give up. But if i want test again how long i need to wait. Or should i go doctors? Please tell me i am not alone.