Trying for a baby!

So my husband and I have decided that we would like to start trying for a baby. I have not been on birth control in a long time, my husband always pulled out (not smart but hey it worked). So approximately 3 weeks ago he did not pull out, and hasn't since. I did receive my period about 10 days ago, and was upset. My next one comes in about 2 weeks, or should. I guess I expected an immediate response, bit maybe it's normal to take longer? I did a test after mylast period, it was negative.