advice?

today me & my boyfriend are 4 years together and im pretty upset because he began ignoring me since yesterday at 8:00 p.m. and at 11:00 he answered me all whatever and said what happend? so i got upset for that cus all he kept doing the whole night was ignoring my msjs and leaving me on READ. or SEEN. & at 12:00 i sent him a msj saying happy 4 years & blah blah alot of emotional things since we are trying to have a baby i mentioned it also & he didnt answer me until today at 7:00 a.m & said "what happend ?" again ! i got upset , i had also posted a photo with him on facebook about our 4 years together and he only liked the picture and didnt reply i felt pretty down about it & since todaynin the morning he hasnt answered me again ..is it something i should'nt  worry about ? i think its pretty emotional to me specialy now that we are trying to have a baby & he recentely left to sandiego to work and i havnt seen him in a week ..