Hard to conceive

Moni trying for #2

I’ve been with the same guy for 7yrs now. We do have unprotected sex every time. Our sex life however isn’t consistent being that we’re both truck drivers, and we’re constantly in different states. I don’t know if the timing is just off when we do have sex, or is something just wrong with me. It’s just crazy that each time we’ve had sex I’ve never gotten pregnant. I thought this month was it being that my cycle came on the 8th and we had sex on the 15th which is within my fertility window. I supposedly ovulated on the 17th. On the 26th which the calendar says is my implantation day, I thought my period came. I had the normal bleeding but it only lasted for 2 days which has never happened. Yesterday when I took my tampon out it was brown old blood on it and not a lot. I Took a dollar tree test this morning but it was negative. One calendar says my period suppose to come tomorrow, and another says the 6th. I’m just confused lol. I have nausea, dull aching headache, cramps like af is on the way, I explored and my cm is creamy brown/yellowish with no odor. I’m trying to stay positive, and not count myself out, but it’s sorta hard. I want to be pregnant so bad!!