Had to leave work

So I'm 7 weeks pregnant today and this is our first ever. I was told by my doctor that I had to leave my work because there was way to much heavy lifting and heavy pulling and I had started bleeding my mid shift. Turns out they believe it was implantation bleeding (that happened around 4 weeks) so now I'm job less and my husband does all the work and I'm incredibly greatful. However every now and then I'll wipe after using the bathroom and I'll have faint blood or dark blood on the paper and it scares me. Is this normal ? I asked my doctor and they said that as long as I don't have heavy bleeding like periods and no stomach cramps I should be fine but it is really scary . It sucks having to leave work and not have that distraction and I am just so nervous we been waiting and waiting for a baby and now we just couldn't bear to loose that. Anybody else with bleeding ? Please share .