Sure can, I have had 2 ectopics and have actually had my entire left tube removed.
I had one back in beginning of June as well and i am TTC now, my doctor told me as soon as i had a normal cycle i could try, now i have only been TTC for 2 months since now but i am sure it will happen when its meant to be, i am glad the methotrexide was able to treat it and both my tubes are okay. its safe to start as soon as you have a normal cycle which you have...so lets get to TTC....:)
I also had an ectopic at the end of April resulting in the loss of my left tube. Very sad...I have been trying again as soon as I had a period which was in July. No sucess yet, but I am still trying!! Good luck!!